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Testing the null of identification in GMM


  • Jonathan H. Wright


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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    References listed on IDEAS

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    5. James Harrigan, 2001. "Specialization and the volume of trade: do the data obey the laws?," Staff Reports 140, Federal Reserve Bank of New York.
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    7. Feldstein, Martin & Horioka, Charles, 1980. "Domestic Saving and International Capital Flows," Economic Journal, Royal Economic Society, vol. 90(358), pages 314-329, June.
    8. Schmidt-Hebbel, Klaus & Serven, Luis & Solimano, Andres, 1996. "Saving and Investment: Paradigms, Puzzles, Policies," World Bank Research Observer, World Bank Group, vol. 11(1), pages 87-117, February.
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    15. Baumol, William J. & Nelson, Richard R. & Wolff, Edward N. (ed.), 1994. "Convergence of Productivity: Cross-National Studies and Historical Evidence," OUP Catalogue, Oxford University Press, number 9780195083903, June.
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    Cited by:

    1. 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.
    2. Inoue, Atsushi & Rossi, Barbara, 2011. "Testing for weak identification in possibly nonlinear models," Journal of Econometrics, Elsevier, vol. 161(2), pages 246-261, April.

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    Econometrics ; Econometric models;


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