Performance persistence studies typically suffer from ex-post conditioning biases. As stressed by Carhart (1997a) and Carpenter and Lynch (1999), standard methods of analysis on a survivorship free sample are subject to look-ahead biases. In this paper, we show how one can easily correct for...

This paper investigates the question whether individual stock momentum in Europe is subsumed by country or industry momentum. We introduce a portfolio-based regression approach, which directly allows to test hypotheses about the existence and relative importance of multiple effects (e.g.,...

The driving force behind the well-documented medium term momentumeffect in stock returns is subject of much debate. Empirical papersthat aim to find the determinants of this return continuation, seem tobe almost exclusively restricted to US stock markets. Consequently,regional effects have...

If missing observations in a panel data set are not missing at random, many widely applied estimators may be inconsistent. In this paper the authors examine empirically several ways to reveal the nature and severity of the selectivity problem due to nonresponse, as well as a number of methods to...

The authors discuss several tests to check for the presence of selectivity bias in estimators based on panel data. One approach to test for selectivity bias is to specify the selection mechanism explicitly and estimate it jointly with the model of interest. Alternatively, one can derive the...