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Alternative estimators for the variance of several normal populations

Author

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  • Madi, Mohamed T.

Abstract

The problem of interest is to estimate the common variance of k (k [greater-or-equal, slanted] 2) normal populations with possibly different means, based on k independent samples from these populations. Improved estimators over the usual estimator under a large class of bowl-shaped loss functions are proposed. These estimators are similar to those of Brewster and Zidek (1974). However, the regions of the parameter space over which these estimators have the most reduction in risk and the magnitude of risk reduction over the usual estimator are different than those of Brewster and Zidek.

Suggested Citation

  • Madi, Mohamed T., 1993. "Alternative estimators for the variance of several normal populations," Statistics & Probability Letters, Elsevier, vol. 17(4), pages 321-328, July.
    • Handle: RePEc:eee:stapro:v:17:y:1993:i:4:p:321-328
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    Cited by:

    1. Nobuo Shinozaki, 1995. "Some modifications of improved estimators of a normal variance," Annals of the Institute of Statistical Mathematics, Springer;The Institute of Statistical Mathematics, vol. 47(2), pages 273-286, June.

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