Cho, David Daewhan - Econometric Society - 2004
second moments can be estimated very accurately. However, time varying volatility and nonnormality of asset returns can lead …/ME sorted portfolios from 1963 to 2001, the loss due to the variance estimation can be shown to be as large as the loss due to … the expected return estimation. Moreover, as the number of assets in the portfolio increases, the loss due to the variance …