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On testing for the mean vector of a multivariate distribution with generalized and {2}-inverses

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  • Duchesne, Pierre
  • Francq, Christian

Abstract

Generalized Wald's method constructs testing procedures having chi-squared limiting distributions from test statistics having singular normal limiting distributions by use of generalized inverses. In this article, the use of two-inverses for that problem is investigated, in order to propose new test statistics with convenient asymptotic chi-square distributions. Alternatively, Imhof-based test statistics can also be defined, which converge in distribution to weighted sum of chi-square variables; The critical values of such procedures can be found using Imhof's (1961) algorithm. The asymptotic distributions of the test statistics under the null and alternative hypotheses are discussed. Under fixed and local alternatives, the asymptotic powers are compared theoretically. Simulation studies are also performed to compare the exact powers of the test statistics in finite samples. A data analysis on the temperature and precipitation variability in the European Alps illustrates the proposed methods.

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Paper provided by University Library of Munich, Germany in its series MPRA Paper with number 19740.

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Date of creation: Jan 2010
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Handle: RePEc:pra:mprapa:19740

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Keywords: two-inverses; generalized Wald's method; generalized inverses; multivariate analysis; singular normal distribution;

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  1. Donald W.K. Andrews, 1985. "Asymptotic Results for Generalized Wald Tests," Cowles Foundation Discussion Papers, Cowles Foundation for Research in Economics, Yale University 761R, Cowles Foundation for Research in Economics, Yale University, revised Apr 1986.
  2. Bhimasankaram, P. & Sengupta, D., 1991. "Testing for the mean vector of a multivariate normal distribution with a possibly singular dispersion matrix and related results," Statistics & Probability Letters, Elsevier, Elsevier, vol. 11(6), pages 473-478, June.
  3. Francq, Christian & Roy, Roch & Zakoian, Jean-Michel, 2005. "Diagnostic Checking in ARMA Models With Uncorrelated Errors," Journal of the American Statistical Association, American Statistical Association, American Statistical Association, vol. 100, pages 532-544, June.
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