Acta mathematica scientia,Series A ›› 2009, Vol. 29 ›› Issue (2): 223-232.

• Articles • Previous Articles     Next Articles

The BLUE and Spectral Decomposition Estimator in General Linear Mixed Models

 XU Li-Wen, WANG Song-Gui   

  1. (College of Sciences, North China University of Technology, Beijing 100144|Department of Mathematical Sciences, Tsinghua University, |Beijing |100084)|(College of Applied Sciences, |Beijing University of Technology, |Beijing 100022)
  • Received:2007-11-05 Revised:2008-12-03 Online:2009-04-25 Published:2009-04-25
  • Supported by:

    中国博士后科学基金(20070410544)和国家自然科学基金(10801085)资助

Abstract:

In this paper,   the estimation of a linear combination of fixed and random effects is investigated  in general linear mixed  models. Explicit expression of the best linear unbiased estimator(BLUE) of  the combination is derived and it is shown that this  BLUE is  essentially-unique where  the covariance matrix of the vector of observations may be singular. For the three small-area models that are all special cases of the general linear mixed model, spectral decomposition estimators(SDE) of small area mean, ui, and variance components are derived. Furthermore, second-order approximations to the MSE of two-stage estimators based on SDE are obtained.

Key words: Linear mixed models, Unbalance data, Best linear unbiased estimator, Two-stage estimator,   Variance components

CLC Number: 

  • 62J05
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