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A Model-Free Measure of Aggregate Idiosyncratic Volatility and the Prediction of Market Returns

Published online by Cambridge University Press:  27 August 2014

René Garcia
Affiliation:
rene.garcia@edhec.edu, EDHEC Business School, 393 Promenade des Anglais, BP 3116, Nice 06202, France and CIREQ and CIRANO
Daniel Mantilla-García
Affiliation:
daniel@optimalam.com, Research Department, Optimal Asset Management, 171 Main St # 298, Los Altos, CA 94022, and EDHEC-Risk Institute
Lionel Martellini
Affiliation:
lionel.martellini@edhec.edu, EDHEC Business School, 393 Promenade des Anglais, BP 3116, Nice 06202, France.

Abstract

In this paper, we formally show that the cross-sectional variance of stock returns is a consistent and asymptotically efficient estimator for aggregate idiosyncratic volatility. This measure has two key advantages: It is model free and observable at any frequency. Previous approaches have used monthly model-based measures constructed from time series of daily returns. The newly proposed cross-sectional volatility measure is a strong predictor for future returns on the aggregate stock market at the daily frequency. Using the cross section of size and book-to-market portfolios, we show that the portfolios’ exposures to the aggregate idiosyncratic volatility risk predict the cross section of expected returns.

Type
Research Articles
Copyright
Copyright © Michael G. Foster School of Business, University of Washington 2015 

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