Testing The Predictability Of Stock Returns

Markku Lanne

The Review of Economics and Statistics, 2002, vol. 84, issue 3, 407-415

Abstract: Previous literature indicates that stock returns are predictable by several strongly autocorrelated forecasting variables, especially at longer horizons. It is suggested that this finding is spurious and follows from a neglected near unit root problem. Instead of the commonly used t-test, we propose a test that can be considered as a general test of whether the return can be predicted by any highly persistent variable. Using this test, no predictability is found for U.S. stock return data from the period 1928-1996. Simulation experiments show that the standard t-test clearly overrejects whereas our proposed test controls size much better. © 2002 by the President and Fellows of Harvard College and the Massachusetts Institute of Technology

Date: 2002
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