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Using out-of-sample mean squared prediction errors to test the martingale difference hypothesis

  • Clark, Todd E.
  • West, Kenneth D.

We consider using out of sample mean squared prediction errors (MSPEs) to evaluate the null that a given series follows a zero mean martingale difference against the alternative that it is linearly predictable. Under the null of zero predictability, the population MSPE of the null “no change” model equals that of the linear alternative. We show analytically and via simulations that despite this equality, the alternative model’s sample MSPE is expected to be greater than the null’s. We propose and evaluate an asymptotically normal test that properly accounts for the upward shift of the sample MSPE of the alternative model. Our simulations indicate that our proposed procedure works well.

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Article provided by Elsevier in its journal Journal of Econometrics.

Volume (Year): 135 (2006)
Issue (Month): 1-2 ()
Pages: 155-186

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Handle: RePEc:eee:econom:v:135:y:2006:i:1-2:p:155-186
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