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Connecting Sharpe ratio and Student t-statistic, and beyond

Benhamou, Eric (2018), Connecting Sharpe ratio and Student t-statistic, and beyond. https://basepub.dauphine.fr/handle/123456789/18910

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Article-Connecting Sharpe ratio.pdf (269.2Kb)
Type
Document de travail / Working paper
Date
2018
Publisher
Preprint Lamsade
Series title
Preprint Lamsade
Published in
Paris
Pages
23
Metadata
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Author(s)
Benhamou, Eric
Laboratoire d'analyse et modélisation de systèmes pour l'aide à la décision [LAMSADE]
Abstract (EN)
Sharpe ratio is widely used in asset management to compare and benchmark funds and asset managers. It computes the ratio of the excess return over the strategy standard deviation. However, the elements to compute the Sharpe ratio, namely, the expected returns and the volatilities are unknown numbers and need to be estimated statistically.This means that the Sharpe ratio used by funds is subject to be error prone because of statistical estimation error. Lo (2002), Mertens (2002) derive explicit expressions for the statistical distribution of the Sharpe ratio using standard asymptotic theory under several sets of assumptions (independent normally distributed - and identically distributed returns). In this paper, we provide the exact distribution of the Sharpe ratio for independent normally distributed return. In this case, the Sharpe ratio statisticis up to a rescaling factor a non centered Student distribution whose characteristics have been widely studied by statisticians. The asymptotic behavior of our distribution provides the result of Lo (2002). We also illustrate the fact that the empirical Sharperatio is asymptotically optimal in the sense that it achieves the Cramer Rao bound. We then study the empirical SR under AR(1) assumptions and investigate the effect ofcompounding period on the Sharpe (computing the annual Sharpe with monthly datafor instance). We finally provide general formula in this case of heteroscedasticity and autocorrelation.
Subjects / Keywords
Sharpe ratio; Student distribution; compounding effect on Sharpe; AR(1); CramerRao bound
JEL
C12 - Hypothesis Testing: General
G11 - Portfolio Choice; Investment Decisions

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