Sorting Out Sorts
22 Pages Posted: 10 Jul 2000 Last revised: 23 Feb 2023
There are 2 versions of this paper
Date Written: September 1998
Abstract
In this paper we analyze the theoretical implications of sorting data into groups and then running asset pricing tests within each group. We show that the way this procedure is implemented introduces a severe bias in favor of rejecting the model under consideration. By simply picking enough groups to sort into even the true asset pricing model can be shown to have no explanatory power within each group.
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