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Testing the Information Matrix Equality with Robust Estimators

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  • Christophe Croux
  • Geert Dhaene
  • Dirk Hoorelbeke

Abstract

We study the behaviour of the information matrix (IM) test when maximum likelihood estimators are replaced with robust estimators. The latter may unmask outliers and hence improve the power of the test. We investigate in detail the local asymptotic power of the IM test in the normal model, for various estimators and under a range of local alternatives. These local alternatives include contamination neighbourhoods, Student's t (with degrees of freedom approaching infinity), skewness, and a tilted normal. Simulation studies for fixed alternatives confirm that in many cases the use of robust estimators substantially increases the power of the IM test.

Suggested Citation

  • Christophe Croux & Geert Dhaene & Dirk Hoorelbeke, 2003. "Testing the Information Matrix Equality with Robust Estimators," Working Papers of Department of Economics, Leuven ces0303, KU Leuven, Faculty of Economics and Business (FEB), Department of Economics, Leuven.
    • Handle: RePEc:ete:ceswps:ces0303
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