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Testing the null of identification in GMM

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  • Jonathan H. Wright

Abstract

This paper proposes a new test of the null hypothesis that a generalized method of moments model is identified. The test can detect local or global underidentification, and underidentification in some or all directions. The idea of the test is to compare the volume of two confidence sets - one that is robust to lack of identification and one that is not. Under the null hypothesis the relative volume of these two sets is Op(1), but under the alternative, the robust confidence set has infinite relative volume.

Suggested Citation

  • Jonathan H. Wright, 2002. "Testing the null of identification in GMM," International Finance Discussion Papers 732, Board of Governors of the Federal Reserve System (U.S.).
    • Handle: RePEc:fip:fedgif:732
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    File URL: http://www.federalreserve.gov/pubs/ifdp/2002/732/default.htm
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    Cited by:

    1. Inoue, Atsushi & Rossi, Barbara, 2011. "Testing for weak identification in possibly nonlinear models," Journal of Econometrics, Elsevier, vol. 161(2), pages 246-261, April.
    2. Dufour, Jean-Marie & Taamouti, Mohamed, 2007. "Further results on projection-based inference in IV regressions with weak, collinear or missing instruments," Journal of Econometrics, Elsevier, vol. 139(1), pages 133-153, July.

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    Keywords

    Econometrics; Econometric models;

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