On some heteroskedasticity-robust estimators of variance-covariance matrix of the least-squares estimators

Anil K. Bera, Totok Suprayitno, Gamini Premaratne

Research output: Contribution to journalArticlepeer-review

Abstract

Chesher and Jewitt (Econometrica 55 (1987) 1217) demonstrated that the Eicker (Ann. Math. Statist. 34 (1963) 447) and White (Econometrica 48 (1980) 817) consistent estimator of the variance-covariance matrix in heteroskedastic models could be severely biased if the design matrix is highly unbalanced. In this paper we, therefore, reconsider Rao's (J. Amer. Statist. Assoc. 65 (1970) 161) minimum norm quadratic unbiased estimator (MINQUE). We derive the analytical expressions for the mean squared errors (MSE) of the Eicker-White, one of MacKinnon and White's (J. Econometrics 29 (1985) 305) and MINQUE estimators, and perform a numerical comparison. Our analysis shows that although MINQUE is unbiased by construction, it has very large variance particularly for the highly unbalanced design matrices. Since the variance is the dominant factor in our MSE computation, MINQUE is not the preferred estimator in terms of MSE comparison. We also studied the finite sample behavior of the confidence interval of regression coefficients in terms of coverage probabilities based on different variance-covariance matrix estimators. Our results indicate that although MINQUE generally has the largest MSE, it performs relatively well in terms of coverage probabilities.

Original languageEnglish (US)
Pages (from-to)121-136
Number of pages16
JournalJournal of Statistical Planning and Inference
Volume108
Issue number1-2
DOIs
StatePublished - Nov 1 2002

Keywords

  • Linear regression model
  • MINQUE
  • Unbiasedness

ASJC Scopus subject areas

  • Statistics and Probability
  • Statistics, Probability and Uncertainty
  • Applied Mathematics

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