Valid inference in partially unstable generalized method of moments models

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This paper considers time series Generalized Method of Moments (GMM) models where a subset of the parameters are time varying. We focus on an empirically relevant case with moderately large instabilities, which are well approximated by a local asymptotic embedding that does not allow the instability to be detected with certainty, even in the limit. We show that for many forms of the instability and a large class of GMM models, usual GMM inference on the subset of stable parameters is asymptotically unaffected by the partial instability. In the empirical analysis of presumably stable parameters - such as structural parameters in Euler conditions - one can thus ignore moderate instabilities in other parts of the model and still obtain approximately correct inference.

Original languageEnglish (US)
Pages (from-to)343-365
Number of pages23
JournalReview of Economic Studies
Issue number1
StatePublished - 2009

All Science Journal Classification (ASJC) codes

  • Economics and Econometrics


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