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Title: In-Sample or Out-of-Sample Tests of Predictability: Which One Should We Use?

Author(s): Atsushi Inoue and Lutz Kilian

Publication Date: December 2002

Keyword(s): data mining, parameter instability, predictability test and reliability of inference

Programme Area(s): International Macroeconomics

Abstract: It is widely known that significant in-sample evidence of predictability does not guarantee significant out-of-sample predictability. This is often interpreted as an indication that in-sample evidence is likely to be spurious and should be discounted. In this Paper we question this conventional wisdom. Our analysis shows that neither data mining nor parameter instability is a plausible explanation of the observed tendency of in-sample tests to reject the no predictability null more often than out-of-sample tests. We provide an alternative explanation based on the higher power of in-sample tests of predictability. We conclude that results of in-sample tests of predictability will typically be more credible than results of out-of-sample tests.

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Bibliographic Reference

Inoue, A and Kilian, L. 2002. 'In-Sample or Out-of-Sample Tests of Predictability: Which One Should We Use?'. London, Centre for Economic Policy Research. https://cepr.org/active/publications/discussion_papers/dp.php?dpno=3671