Abstract
Suppose y is normally distributed with mean IRn and covariance σ2V, where σ2>0 and V>0 is known. The n. s. conditions that a linear estimator Ay+a of μ be admissible in the class of all estimators of μ which depend only on y are derived. In particular, the usual estimator δ0(y)=y is admissible in this class. The results are applied to the normal linear model and the admissibilities of many well-known linear estimators are demonstrated.
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Wang, L. Admissible linear estimators of the multivariate normal mean without extra information. Statistical Papers 32, 155–165 (1991). https://doi.org/10.1007/BF02925488
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DOI: https://doi.org/10.1007/BF02925488