Optimal Linear Estimation of Bounds of Random Variables
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The problem of estimating the bounds of random variables has been discussed by Cooke (1979). Here we discuss optimality of estimators when the data are censored so that only the r largest or smallest of the observations are available for estimating a bound. For fixed r we find the linear function of the censored data which is the optimal estimator of a bound in the sense that, when the sample size is large, the estimator has smallest mean squared error among all such linear estimators. Even for r small, these estimators are almost optimal when the entire sample is available, since for example, when estimating an upper bound and the sample size is large, the largest few observations carry most of the information about the bound.