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1 | (4) |
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2 Glossary, Definitions, And Notations |
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5 | (14) |
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2.1 General Notations and Frequently Used Symbols |
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5 | (2) |
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2.2 Catalogue Raisonne of General & Idiosyncratic concepts |
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7 | (12) |
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7 | (1) |
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2.2.2 Law of Large Numbers (Weak) |
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8 | (1) |
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2.2.3 The Central Limit Theorem (CLT) |
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8 | (1) |
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2.2.4 Law of Medium Numbers or Preasymptotics |
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8 | (1) |
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8 | (1) |
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2.2.6 Elliptical Distribution |
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9 | (1) |
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2.2.7 Statistical independence |
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9 | (1) |
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2.2.8 Stable (Levy stable) Distribution |
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10 | (1) |
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2.2.9 Multivariate Stable Distribution |
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10 | (1) |
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10 | (1) |
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10 | (1) |
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2.2.12 Student T as Proxy |
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11 | (1) |
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11 | (1) |
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2.2.14 Rent seeking in academia |
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12 | (1) |
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2.2.15 Pseudo-empiricism or Pinker Problem |
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12 | (1) |
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12 | (1) |
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13 | (1) |
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2.2.18 Value at Risk, Conditional VaR |
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13 | (1) |
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13 | (1) |
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14 | (1) |
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2.2.21 Maximum Domain of Attraction, MDA |
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14 | (1) |
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2.2.22 Substitution of Integral in the psychology literature |
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14 | (1) |
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2.2.23 Inseparability of Probability (another common error) |
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15 | (1) |
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2.2.24 Wittgenstein's Ruler |
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15 | (1) |
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15 | (1) |
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2.2.26 The Empirical Distribution is Not Empirical |
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16 | (1) |
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17 | (1) |
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17 | (1) |
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17 | (1) |
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17 | (1) |
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18 | (1) |
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I FAT TAILS AND THEIR EFFECTS, AN INTRODUCTION |
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19 | (100) |
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3 A Non-Technical Overview - The Darwin Collece Lecture*‡ |
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21 | (44) |
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3.1 On the Difference Between Thin and Thick Tails |
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21 | (2) |
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3.2 Tail Wagging Dogs: An Intuition |
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23 | (2) |
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3.3 A (More Advanced) Categorization and Its Consequences |
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25 | (5) |
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3.4 The Main Consequences and How They Link to the Book |
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30 | (11) |
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37 | (2) |
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3.4.2 The Law of Large Numbers |
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39 | (2) |
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3.5 Epistemology and Inferential Asymmetry |
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41 | (5) |
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3.6 Naive Empiricism: Ebola Should Not Be Compared to Falls from Ladders |
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46 | (4) |
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3.6.1 How some multiplicative risks scale |
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49 | (1) |
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3.7 Primer on Power Laws (almost without mathematics) |
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50 | (3) |
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3.8 Where Are the Hidden Properties? |
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53 | (3) |
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56 | (1) |
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3.10 X vs F(X): exposures to X confused with knowledge about X |
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57 | (3) |
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3.11 Ruin and Path Dependence |
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60 | (3) |
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63 | (2) |
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4 Univariate Fat Tails, Level 1, Finite Moments† |
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65 | (24) |
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4.1 A Simple Heuristic to Create Mildly Fat Tails |
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65 | (5) |
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4.1.1 A Variance-preserving heuristic |
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67 | (1) |
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4.1.2 Fattening of Tails With Skewed Variance |
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68 | (2) |
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4.2 Does Stochastic Volatility Generate Power Laws? |
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70 | (1) |
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4.3 The Body, The Shoulders, and The Tails |
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71 | (4) |
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4.3.1 The Crossovers and Tunnel Effect |
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72 | (3) |
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4.4 Fat Tails, Mean Deviation and the Rising Norms |
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75 | (11) |
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75 | (1) |
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76 | (2) |
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4.4.3 Effect of Fatter Tails on the "efficiency" of STD vs MD |
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78 | (1) |
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4.4.4 Moments and The Power Mean Inequality |
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79 | (3) |
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4.4.5 Comment: Why we should retire standard deviation, now! |
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82 | (4) |
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4.5 Visualizing the Effect of Rising p on Iso-Norms |
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86 | (3) |
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5 Level 2: Subexponentials and power laws |
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89 | (16) |
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5.0.1 Revisiting the Rankings |
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89 | (2) |
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5.0.2 What is a Borderline Probability Distribution? |
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91 | (1) |
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5.0.3 Let Us Invent a Distribution |
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92 | (1) |
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5.1 Level 3: Scalability and Power Laws |
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93 | (3) |
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5.1.1 Scalable and Nonscalable, A Deeper View of Fat Tails |
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93 | (2) |
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95 | (1) |
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5.2 Some Properties of Power Laws |
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96 | (2) |
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96 | (1) |
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97 | (1) |
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5.3 Bell Shaped vs Non Bell Shaped Power Laws |
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98 | (1) |
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5.4 Interpolative powers of Power Laws: An Example |
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99 | (1) |
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5.5 Super-Fat Tails: The Log-Pareto Distribution |
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99 | (1) |
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5.6 Pseudo-Stochastic Volatility: An investigation |
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100 | (5) |
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6 Thick Tails In Hicher Dimensions† |
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105 | (14) |
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6.1 Thick Tails in Higher Dimension, Finite Moments |
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106 | (2) |
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6.2 Joint Fat-Tailedness and Ellipticality of Distributions |
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108 | (2) |
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6.3 Multivariate Student T |
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110 | (2) |
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6.3.1 Ellipticality and Independence under Thick Tails |
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111 | (1) |
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6.4 Fat Tails and Mutual Information |
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112 | (2) |
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6.5 Fat Tails and Random Matrices, a Rapid Interlude |
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114 | (1) |
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6.6 Correlation and Undefined Variance |
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114 | (2) |
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6.7 Fat Tailed Residuals in Linear Regression Models |
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116 | (3) |
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A Special Cases Of Thick Tails |
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119 | (6) |
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A.1 Multimodality and Thick Tails, or the War and Peace Model |
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119 | (4) |
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A.2 Transition Probabilities: What Can Break Will Break |
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123 | (2) |
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II THE LAW OF MEDIUM NUMBERS |
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125 | (48) |
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7 Limit Distributions, A Con Soli Dation*† |
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127 | (16) |
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7.1 Refresher: The Weak and Strong LLN |
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127 | (2) |
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7.2 Central Limit in Action |
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129 | (2) |
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7.2.1 The Stable Distribution |
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129 | (1) |
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7.2.2 The Law of Large Numbers for the Stable Distribution |
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130 | (1) |
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7.3 Speed of Convergence of CLT: Visual Explorations |
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131 | (4) |
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7.3.1 Fast Convergence: the Uniform Dist |
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131 | (1) |
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7.3.2 Semi-slow convergence: the exponential |
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132 | (1) |
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133 | (2) |
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7.3.4 The half-cubic Pareto and its basin of convergence |
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135 | (1) |
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7.4 Cumulants and Convergence |
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135 | (2) |
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7.5 Technical Refresher: Traditional Versions of CLT |
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137 | (1) |
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7.6 The Law of Large Numbers for Higher Moments |
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138 | (3) |
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138 | (3) |
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7.7 Mean deviation for a Stable Distributions |
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141 | (2) |
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8 How much data do you need? An operational metric for fat-Tailedness‡ |
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143 | (18) |
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8.1 Introduction and Definitions |
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144 | (2) |
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146 | (2) |
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8.3 Stable Basin of Convergence as Benchmark |
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148 | (3) |
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8.3.1 Equivalence for Stable distributions |
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149 | (1) |
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8.3.2 Practical significance for sample sufficiency |
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149 | (2) |
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8.4 Technical Consequences |
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151 | (1) |
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8.4.1 Some Oddities With Asymmetric Distributions |
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151 | (1) |
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8.4.2 Rate of Convergence of a Student T Distribution to the Gaussian Basin |
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151 | (1) |
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8.4.3 The Lognormal is Neither Thin Nor Fat Tailed |
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152 | (1) |
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8.4.4 Can Kappa Be Negative? |
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152 | (1) |
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8.5 Conclusion and Consequences |
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152 | (2) |
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8.5.1 Portfolio Pseudo-Stabilization |
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153 | (1) |
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8.5.2 Other Aspects of Statistical Inference |
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154 | (1) |
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154 | (1) |
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8.6 Appendix, Derivations, and Proofs |
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154 | (7) |
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8.6.1 Cubic Student T (Gaussian Basin) |
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154 | (2) |
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156 | (2) |
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158 | (1) |
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8.6.4 Negative Kappa, Negative Kurtosis |
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159 | (2) |
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9 Extreme Values And Hidden Tails*† |
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161 | (12) |
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9.1 Preliminary Introduction to EVT |
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161 | (6) |
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9.1.1 How Any Power Law Tail Leads to Fr6chet |
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163 | (1) |
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164 | (2) |
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9.1.3 The Picklands-Balkema-de Haan Theorem |
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166 | (1) |
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9.2 The Invisible Tail for a Power Law |
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167 | (3) |
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9.2.1 Comparison with the Normal Distribution |
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170 | (1) |
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9.3 Appendix: The Empirical Distribution is Not Empirical |
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170 | (3) |
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B Growth Rate And Outcome Are Not In The Same Distribution Class |
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173 | (4) |
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173 | (3) |
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B.2 Pandemics are really Fat Tailed |
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176 | (1) |
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C The Large Deviation Principle, In Brief |
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177 | (4) |
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D Calibrating Under Paretianity |
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181 | (18) |
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D.1 Distribution of the sample tail Exponent |
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183 | (2) |
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10 "It is what it is": diagnosing the SP500† |
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185 | (14) |
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10.1 Paretianity and Moments |
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185 | (2) |
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187 | (10) |
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10.2.1 Test 1: Kurtosis under Aggregation |
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187 | (1) |
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188 | (1) |
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189 | (1) |
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10.2.4 Test 2: Excess Conditional Expectation |
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190 | (2) |
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10.2.5 Test 3iJnstability of 4th moment |
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192 | (1) |
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192 | (2) |
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10.2.7 Records and Extrema |
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194 | (3) |
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10.2.8 Asymmetry right-left tail |
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197 | (1) |
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10.3 Conclusion: It is what it is |
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197 | (2) |
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E The Problem With Econometrics |
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199 | (8) |
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E.1 Performance of Standard Parametric Risk Estimators |
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200 | (2) |
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E.2 Performance of Standard NonParametric Risk Estimators |
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202 | (5) |
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F Machine Learning Considerations |
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207 | (4) |
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F.0.1 Calibration via Angles |
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209 | (2) |
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III PREDICTIONS, FORECASTING, AND UNCERTAINTY |
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211 | (38) |
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11 Probability Calibration Under Fat Tails‡ |
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213 | (22) |
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11.1 Continuous vs. Discrete Payoffs: Definitions and Comments |
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214 | (5) |
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11.1.1 Away from the Verbalistic |
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215 | (3) |
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11.1.2 There is no defined "collapse", "disaster", or "success" under fat tails |
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218 | (1) |
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11.2 Spurious overestimation of tail probability in psychology |
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219 | (6) |
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220 | (1) |
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220 | (1) |
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221 | (3) |
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11.2.4 Distributional Uncertainty |
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224 | (1) |
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11.3 Calibration and Miscalibration |
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225 | (1) |
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225 | (4) |
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11.4.1 Deriving Distributions |
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228 | (1) |
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11.5 Non-Verbalistic Payoff Functions/Machine Learning |
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229 | (3) |
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232 | (1) |
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11.7 Appendix: Proofs and Derivations |
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232 | (3) |
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11.7.1 Distribution of Binary Tally pW(n) |
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232 | (1) |
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11.7.2 Distribution of the Brier Score |
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233 | (2) |
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12 Election Predictions As Martingales: An Arbitrage Approach‡ |
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235 | (14) |
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237 | (1) |
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238 | (2) |
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12.0.3 A Discussion on Risk Neutrality |
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240 | (1) |
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12.1 The Bachelier-Style valuation |
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240 | (2) |
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12.2 Bounded Dual Martingale Process |
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242 | (3) |
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12.3 Relation to De Finetti's Probability Assessor |
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245 | (1) |
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12.4 Conclusion and Comments |
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245 | (4) |
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IV INEQUALITY ESTIMATORS UNDER FAT TAILS |
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249 | (36) |
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13 Gini Estimation Under Infinite Variance‡ |
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251 | (20) |
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251 | (4) |
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13.2 Asymptotics of the Nonparametric Estimator under Irifinite Variance |
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255 | (3) |
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13.2.1 A Quick Recap on a-Stable Random Variables |
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256 | (1) |
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13.2.2 The a-Stable Asymptotic Limit of the Gini Index |
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257 | (1) |
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13.3 The Maximum Likelihood Estimator |
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258 | (1) |
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13.4 A Paretian illustration |
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259 | (3) |
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13.5 Small Sample Correction |
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262 | (3) |
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265 | (6) |
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14 On The Super-Additivity And Estimation Biases Of Quantile Contributions‡ |
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271 | (14) |
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271 | (2) |
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14.2 Estimation For Unmixed Pareto-Tailed Distributions |
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273 | (3) |
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14.2.1 Bias and Convergence |
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273 | (3) |
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14.3 An Inequality About Aggregating Inequality |
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276 | (3) |
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14.4 Mixed Distributions For The Tail Exponent |
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279 | (3) |
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14.5 A Larger Total Sum is Accompanied by Increases in jc9 |
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282 | (1) |
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14.6 Conclusion and Proper Estimation of Concentration |
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282 | (3) |
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14.6.1 Robust methods and use of exhaustive data |
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283 | (1) |
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14.6.2 How Should We Measure Concentration? |
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283 | (2) |
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285 | (32) |
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15 Shadow Moments Of Apparently Infinite-Mean Phenomena‡ |
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287 | (10) |
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287 | (1) |
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15.2 The dual Distribution |
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288 | (2) |
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15.3 Back to Y: the shadow mean (or population mean) |
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290 | (3) |
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15.4 Comparison to Other Methods |
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293 | (1) |
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294 | (3) |
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16 On The Tail Risk Of Violent Conflict (With P. Cirillo)‡ |
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297 | (20) |
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16.1 Introduction/Summary |
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297 | (3) |
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16.2 Summary statistical discussion |
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300 | (2) |
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300 | (1) |
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301 | (1) |
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16.3 Methodological Discussion |
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302 | (4) |
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302 | (1) |
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16.3.2 Expectation by Conditioning (less rigorous) |
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303 | (1) |
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16.3.3 Reliability of Data and Effect on Tail Estimates |
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304 | (1) |
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16.3.4 Definition of An "Event" |
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305 | (1) |
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306 | (1) |
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306 | (1) |
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306 | (6) |
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16.4.1 Peaks over Threshold |
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307 | (1) |
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16.4.2 Gaps in Series and Autocorrelation |
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308 | (1) |
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309 | (2) |
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16.4.4 An Alternative View on Maxima |
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311 | (1) |
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311 | (1) |
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16.5 Additional robustness and reliability tests |
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312 | (2) |
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16.5.1 Bootstrap for the GPD |
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312 | (1) |
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16.5.2 Perturbation Across Bounds of Estimates |
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313 | (1) |
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16.6 Conclusion: is the world more unsafe than it seems? |
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314 | (2) |
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316 | (1) |
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G WHAT ARE THE CHANCES OF A THIRD WORLD WAR?*† |
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317 | (4) |
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VI METAPROBABILITY PAPERS |
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321 | (34) |
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17 How Thick Tails Emerge From Recursive Epistemic Uncertainty† |
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323 | (12) |
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17.1 Methods and Derivations |
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324 | (7) |
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17.1.1 Layering Uncertainties |
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324 | (1) |
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17.1.2 Higher Order Integrals in the Standard Gaussian Case |
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325 | (4) |
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17.1.3 Effect on Small Probabilities |
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329 | (2) |
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17.2 Regime 2: Cases of decaying parameters a(n) |
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331 | (2) |
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17.2.1 Regime 2-a;"Bleed" of Higher Order Error |
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331 | (1) |
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17.2.2 Regime 2-b; Second Method, a Non Multiplicative Error Rate |
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332 | (1) |
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333 | (2) |
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18 Stochastic Tail Exponent For Asymmetric Power Laws† |
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335 | (10) |
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336 | (1) |
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18.2 One Tailed Distributions with Stochastic Alpha |
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336 | (3) |
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336 | (1) |
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18.2.2 Stochastic Alpha Inequality |
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337 | (1) |
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18.2.3 Approximations for the Class B |
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338 | (1) |
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339 | (1) |
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18.4 Asymmetric Stable Distributions |
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340 | (1) |
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18.5 Pareto Distribution with lognormally distributed α |
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341 | (1) |
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18.6 Pareto Distribution with Gamma distributed Alpha |
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342 | (1) |
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18.7 The Bounded Power Law in Cirillo and Taleb (2016) |
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342 | (1) |
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343 | (1) |
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343 | (2) |
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19 Meta-Distribution Of P-Values And P-Hackinc‡ |
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345 | (10) |
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19.1 Proofs and derivations |
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347 | (4) |
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19.2 Inverse Power of Test |
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351 | (1) |
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19.3 Application and Conclusion |
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352 | (3) |
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H SOME CONFUSIONS IN BEHAVIORAL ECONOMICS |
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355 | (6) |
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H.1 Case Study: How the myopic loss aversion is misspecified |
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355 | (6) |
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VII Option Trading And Pricing Under Fat Tails |
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361 | (58) |
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20 Financial Theory's Failures With Option Pricing† |
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363 | (4) |
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20.1 Bachelier not Black-Scholes |
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363 | (4) |
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20.1.1 Distortion from Idealization |
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364 | (2) |
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20.1.2 The Actual Replication Process |
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366 | (1) |
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20.1.3 Failure: How Hedging Errors Can Be Prohibitive |
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366 | (1) |
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21 Unique Option Pricing Measure (No Dynamic Hedging/Complete Markets)‡ |
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367 | (8) |
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367 | (2) |
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369 | (4) |
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21.2.1 Case 1: Forward as risk-neutral measure |
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369 | (1) |
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369 | (4) |
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21.3 Case where the Forward is not risk neutral |
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373 | (1) |
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373 | (2) |
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22 Option Traders Never Use The Black-Scholes-Merton Formula‡ |
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375 | (16) |
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22.1 Breaking the Chain of Transmission |
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375 | (1) |
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22.2 Introduction/Summary |
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376 | (3) |
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22.2.1 Black-Scholes was an argument |
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376 | (3) |
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22.3 Myth 1: Traders did not price options before BSM |
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379 | (1) |
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22.4 Methods and Derivations |
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380 | (4) |
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22.4.1 Option formulas and Delta Hedging |
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383 | (1) |
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22.5 Myth 2: Traders Today use Black-Scholes |
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384 | (1) |
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385 | (1) |
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22.6 On the Mathematical Impossibility of Dynamic Hedging |
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385 | (6) |
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22.6.1 The (confusing) Robustness of the Gaussian |
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387 | (1) |
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22.6.2 Order Flow and Options |
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388 | (1) |
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388 | (3) |
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23 Option Pricing Under Power Laws: A Robust Heuristic*‡ |
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391 | (8) |
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392 | (1) |
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23.2 Call Pricing beyond the Karamata constant |
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392 | (4) |
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23.2.1 First approach, S is in the regular variation class |
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393 | (1) |
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23.2.2 Second approach, S has geometric returns in the regular variation class |
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394 | (2) |
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396 | (1) |
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23.4 Arbitrage Boundaries |
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397 | (1) |
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398 | (1) |
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24 Four Mistakes In Quantitative Finance*‡ |
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399 | (6) |
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24.1 Conflation of Second and Fourth Moments |
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399 | (1) |
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24.2 Missing Jensen's Inequality in Analyzing Option Returns |
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400 | (1) |
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24.3 The Inseparability of Insurance and Insured |
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401 | (1) |
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24.4 The Necessity of a Numeraire in Finance |
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402 | (1) |
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24.5 Appendix (Betting on Tails of Distribution) |
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402 | (3) |
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25 Tail Risk Constraints And Maximum Entropy (w. D & H. Ceman)‡ |
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405 | (14) |
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25.1 Left Tail Risk as the Central Portfolio Constraint |
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405 | (3) |
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25.1.1 The Barbell as seen by E.T. Jaynes |
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408 | (1) |
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25.2 Revisiting the Mean Variance Setting |
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408 | (2) |
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25.2.1 Analyzing the Constraints |
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409 | (1) |
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25.3 Revisiting the Gaussian Case |
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410 | (2) |
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25.3.1 A Mixture of Two Normals |
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411 | (1) |
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412 | (5) |
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25.4.1 Case A: Constraining the Global Mean |
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413 | (1) |
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25.4.2 Case B: Constraining the Absolute Mean |
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414 | (1) |
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25.4.3 Case C: Power Laws for the Right Tail |
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415 | (1) |
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25.4.4 Extension to a Multi-Period Setting: A Comment |
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415 | (2) |
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25.5 Comments and Conclusion |
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417 | (1) |
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417 | (2) |
Bibliography and Index |
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419 | |