A presentation of a class of ratio- and regression-type estimators such that the estimators are unbiased for random sampling, without replacement, from a finite population. Nonnegative unbiased estimators of estimator variance are provided for a subclass. Similar results are given for the case of generalized procedures of sampling without replacement. Efficiency is compared with comparable estimation-sample-selection methods for this case. (Published in the Journal of the American Statistical Association, Sept. 1959.)
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