Analysis reveals enhanced estimators under conditions of unknown population variances and covariances.
Estimators for use with sampling with partial replacement (SPR) on two occasions are reviewed. Estimation of both current values and change in those values is considered. Given that population variances and covariances are unknown, estimators are presented that are improvements over those suggested in the literature. An example of the use of the estimators is provided. Forest Sci. 30:157-166.
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Charles T. Scott (1984) studied this question.
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