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Can out-of-sample forecast comparisons help prevent overfitting?

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  • Todd E. Clark

    (Federal Reserve Bank of Kansas City, Kansas City, USA)

Abstract

This paper shows that out-of-sample forecast comparisons can help prevent data mining-induced overfitting. The basic results are drawn from simulations of a simple Monte Carlo design and a real data-based design similar to those used in some previous studies. In each simulation, a general-to-specific procedure is used to arrive at a model. If the selected specification includes any of the candidate explanatory variables, forecasts from the model are compared to forecasts from a benchmark model that is nested within the selected model. In particular, the competing forecasts are tested for equal MSE and encompassing. The simulations indicate most of the post-sample tests are roughly correctly sized. Moreover, the tests have relatively good power, although some are consistently more powerful than others. The paper concludes with an application, modelling quarterly US inflation. Copyright © 2004 John Wiley & Sons, Ltd.

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Bibliographic Info

Article provided by John Wiley & Sons, Ltd. in its journal Journal of Forecasting.

Volume (Year): 23 (2004)
Issue (Month): 2 ()
Pages: 115-139

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Handle: RePEc:jof:jforec:v:23:y:2004:i:2:p:115-139

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Web page: http://www3.interscience.wiley.com/cgi-bin/jhome/2966

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