There are now a large and rapidly growing number of studies that test the constancy of stock return anomalies. In this study, we produce new and convincing evidence that the standard constancy test is heavily influenced by selection bias. Backed by a carefully designed Monte Carlo simulation, we...

Before 1975, the mean weekend rate of return on the equal-weight (value-weight) stock market portfolio is significant -18bp (-19bp). After 1975, it is insignificant -5bp (-1bp). This break date is determined by a structural break test with unknown break date. The weekend effect is no longer an...

We replicate French, Schwert, and Stambaugh (1987) (FSS) with up-to-date data and new tools from the modern toolbox of econometric methods. As we proceed, we highlight the main technical details and econometric methods from the original study and, when necessary, update them. While our main goal...