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A Generalization of Rao's Covariance Structure with Applications to Several Linear Models

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  • Kurata, Hiroshi

Abstract

This paper presents a generalization of Rao's covariance structure. In a general linear regression model, we classify the error covariance structure into several categories and investigate the efficiency of the ordinary least squares estimator (OLSE) relative to the Gauss-Markov estimator (GME). The classification criterion considered here is the rank of the covariance matrix of the difference between the OLSE and the GME. Hence our classification includes Rao's covariance structure. The results are applied to models with special structures: a general multivariate analysis of variance model, a seemingly unrelated regression model, and a serial correlation model.

Suggested Citation

  • Kurata, Hiroshi, 1998. "A Generalization of Rao's Covariance Structure with Applications to Several Linear Models," Journal of Multivariate Analysis, Elsevier, vol. 67(2), pages 297-305, November.
    • Handle: RePEc:eee:jmvana:v:67:y:1998:i:2:p:297-305
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