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Practical Risk-Adjusted Performance Measurement Carl R. Bacon )WILEY A John Wiley & Sons, Ltd., Publication Contents Preface xv Acknowledgements xvii 1 Introduction 1 Definition of risk 1 Risk types 1 Risk management v risk control 4 Risk aversion 4 Ex-post and ex-ante 4 Dispersion 5 2 Descriptive Statistics 7 Mean (or arithmetic mean) 7 Annualised return 8 Continuously compounded returns (or log returns) 8 Winsorised mean 9 Mean absolute deviation (or mean deviation) * 9 Variance 10 Mean difference (absolute mean difference or Gini mean difference) 12 Relative mean difference 14 Bessel's correction (population or sample, n or n— 1) 14 Sample variance 17 Standard deviation (variability or volatility) — 17 Annualised risk (or time aggregation) 18 The Central Limit Theorem 19 Contents Janssen annualisation 19 Frequency and number of data points 19 Normal (or Gaussian) distribution 21 Histograms 22 Skewness (Fisher's or moment skewness) 22 Sample skewness 24 Kurtosis (Pearson's kurtosis) 24 Excess kurtosis (or Fisher's kurtosis) 25 Sample kurtosis 25 Bera-Jarque statistic (or Jarque-Bera) 27 Covariance 28 Sample covariance 30 Correlation (p) 30 Sample correlation 32 Up capture indicator 32 Down capture indicator 34 Up number ratio 34 Down number ratio 34 Up percentage ratio 35 Down percentage ratio 35 Percentage gain ratio 35 Hurst index (or Hurst exponent) 35 Bias ratio 37 3 Simple Risk Measures 43 Performance appraisal 43 Sharpe ratio (reward to variability, Sharpe index) 43 Roy ratio 46 Risk free rate 46 Alternative Sharpe ratio 47 Revised Sharpe ratio 48 Adjusted Sharpe ratio 48 Skewness-kurtosis ratio 49 MAD ratio 49 Gini ratio 52 Relative risk 53 Tracking error (or tracking risk, relative risk, active risk) 53 Relative skewness 54 Relative kurtosis 55 Contents ix Information ratio 55 Geometric information ratio 56 Modified information ratio 57 Adjusted information ratio 61 Relative Hurst 61 4 Regression Analysis 69 Regression equation 69 Regression alpha (a/?) 70 Regression beta (/*/?) 70 Regression epsilon (eR) 70 Capital Asset Pricing Model (CAPM) 71 Beta (jS) (systematic risk or volatility) 71 Jensen's alpha (Jensen's measure or Jensen's differential return or ex-post alpha) 72 Annualised alpha 72 Bull beta ($ + ) 73 Bear beta (P~) 73 Beta timing ratio 73 Market timing 78 Systematic risk 81 R2 (or coefficient of determination) 83 Specific or residual risk 83 Treynor ratio (reward to volatility) 84 Modified Treynor ratio 86 Appraisal ratio (or Treynor-B lack ratio) 86 Modified Jensen 87 Fama decomposition 88 Selectivity 88 Diversification 88 Net selectivity 89 Fama-French three factor model 89 Three factor alpha (or Fama-French alpha) 91 Carhart four factor model 91 Four factor alpha (or Carhart's alpha) 91 K ratio 91 5 Drawdown 97 Drawdown 97 Contents Average drawdown 97 Maximum drawdown (or peak to valley drawdown) 98 Largest individual drawdown 98 Recovery time (or drawdown duration) 98 Drawdown deviation 98 Ulcer index 99 Pain index 100 Calmar ratio (or drawdown ratio) 100 MAR ratio 100 Sterling ratio 100 Sterling-Calmar ratio 101 Burke ratio 102 Modified Burke ratio 102 Martin ratio (or Ulcer performance index) 102 Pain ratio 103 Lake ratio 103 Peak ratio 106 6 Partial Moments 107 Downside risk (or semi-standard deviation) 107 Pure downside risk 108 Half variance (or semi-variance) 108 Upside risk (or upside uncertainty) 108 Mean absolute moment 109 Omega ratio (Q) 110 Bernardo and Ledoit (or gain-loss) ratio 110 d ratio 110 Omega-Sharpe ratio 111 Sortino ratio 112 Reward to half-variance 112 Downside risk Sharpe ratio 113 Downside information ratio 113 Kappa (Ki) (or Sortino-Satchell ratio) 113 Upside potential ratio 114 Volatility skewness 114 Variability skewness 115 Farinelli-Tibiletti ratio 115 Prospect ratio 117 Contents 7 Extreme Risk 119 Extreme events 119 Extreme value theory 119 Value at risk (Va/?) 119 Relative Va/? 120 Ex-post Va/? 120 Potential upside (gain at risk) 121 Percentile rank 121 Va/? calculation methodology 122 Parametric Va/? 124 Modified Va/? 125 Historical simulation (or non-parametric) 125 Monte Carlo simulation 126 Which methodology for calculating Va/? should be used? 126 Frequency and time aggregation 127 Time horizon 127 Window length 127 Reward to Va/? 128 Reward to relative Va/? 129 Double Va/? ratio 129 Conditional Va/? (expected shortfall, tail loss, tail Va/? or average Va/?) 130 Upper CVa/? or CVa/? + 131 Lower CVa/? or CVa/?" 131 Tail gain (expected gain or expected upside) 132 Conditional Sharpe ratio (STARR ratio or reward to conditional Va/?) 133 Modified Sharpe ratio (reward to modified Va/?) 136 Tail risk 136 Tail ratio 137 Rachev ratio (or R ratio) 137 Generalised Rachev ratio 137 Drawdown at risk 138 Conditional drawdown at risk 138 Reward to conditional drawdown 138 Generalised Z ratio 138 Contents 8 Fixed Income Risk 141 Pricing fixed income instruments 141 Redemption yield (yield to maturity) 141 Weighted average cash flow 141 Duration (effective mean term, discounted mean term or volatility) 142 Macaulay duration 142 Macaulay-Weil duration 143 Modified duration 143 Portfolio duration 144 Effective duration (or option-adjusted duration) 145 Duration to worst 146 Convexity 147 Modified convexity 147 Effective convexity 148 Portfolio convexity 148 Bond returns 149 Duration beta 150 Reward to duration 151 9 Risk-adjusted Return 153 Risk-adjusted return 153 M2 153 M2 excess return 154 Differential return 155 GH1 (Graham & Harvey 1) 156 GH2 (Graham & Harvey 2) 156 Correlation and risk-adjusted return M3 157 Return adjusted for downside risk 158 Adjusted M2 160 Omega excess return 161 10 Which Risk Measure to Use? 163 Why measure ex-post risk? 163 Which risk measures to use? 164 Hedge funds 164 Smoothing 169 Outliers — 171 Data minine 171 Contents xiii Risk measures and the Global Investment Performance Standards (GIPS®) 172 Fund rating systems 174 Risk efficiency ratio 175 Which measures are actually used? 176 Which risk measures should really be used? 178 11 Risk Control 181 Regulations in the investment risk area 181 Risk control structure 182 Risk management 183 Glossary of Key Terms 189 Appendix A - Composite Internal Risk Measures 193 Appendix B - Absolute Risk Dashboard 195 Appendix C - Relative Risk Dashboard 199 Bibliography 203 Index 209.
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    JWBK558-bind JWBK558-Bacon Printer: Yet to Come September 5, 2012 17:27 Trim: 229mm × 152mm Index 9/11 terrorist attacks 186 appendices 193–202 appraisal ratio 86–7, 165 Abdulali, Adil 37 arbitrage 181–2 absolute mean difference 12, 14 arithmetic information ratio 55–61 absolute risk dashboard 180, 195–8 arithmetic mean 7–8, 45–6, 191 active risk see tracking error arithmetic tracking error 53–4, 55–67 adjusted information ratio 61–3 asset allocation decisions, portfolio adjusted M2 160–1, 168, 179–80 managers 73, 78 adjusted Sharpe ratio (ASR) 48–9, 52, asset managers 2, 3, 57, 164, 183–7 160–1, 167, 179–80, 183, 196 Association for Investment Management AIMR see Association for Investment and Research (AIMR) 16–17 Management and Research see also CFA-Institute alpha 71–3, 74–5, 81, 83, 86–7, 90–6, asymmetrical distributions 23–4, 49, 52, 165, 168, 177–9, 189, 200–1 179–80 see also Fama-French alpha;Jensen’s see also skewness alpha; regression alpha audit 183 alternative investmentshttp://www.pbookshop.com 42, 164, 169, average drawdown 97, 100–1, 105, 165, 173–4 171, 178 alternative modified Jensen 88 average VaR see conditional VaR alternative Sharpe ratio 47–9, 52 averages 7–8 analytical VaR 122, 124 see also mean; median; mode annual arithmetic mean 8 annualised alpha COPYRIGHTED72–3, 200–1 back-tests, MATERIAL VaR 182 annualised returns 7, 8, 12, 19, 44–9, Bacon, Francis 1 56–61, 155–6, 172–4, 189, 193–4, banks 181–2 196, 197, 200 bear beta 73, 78–81 annualised risk 18, 44–9, 56–61, 127, bell curves see normal distributions 155–6,