NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Why Long Horizons: A Study of Power Against Persistent Alternatives

John Y. Campbell

NBER Technical Working Paper No. 142
Issued in September 1993
NBER Program(s):   AP

This paper studies tests of predictability in regressions with a given AR(1) regressor and an asset return dependent variable measured over a short or long horizon. The paper shows that when there is a persistent predictable component in the return, an increase in the horizon may increase the R2 statistic of the regression and the approximate slope of a predictability test. Mone Carlo experiments show that long-horizon regression tests have serious size distortions when asymptotic critical values are used, but some versions of such tests have power advantages remaining after size is corrected.

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Document Object Identifier (DOI): 10.3386/t0142

Published: Campbell, John Y. "Why Long Horizons? A Study Of Power Against Persistent Alternatives," Journal of Empirical Finance, 2001, v8(5,Dec), 459-491.

 
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