Searls in 1964 showed that when the coefficient of variation is known, the sample mean is dominated with respect to mean squared error by an improved estimator that ...

Sankhyā: The Indian Journal of Statistics, Series B (1960-2002), Vol. 38, No. 1 (Feb., 1976), pp. 62-67 (6 pages) Positive valued estimators are proposed for the positive mean of a normal distribution ...