Optimal Estimation of a Finite Population Mean in the Presence of Linear Trend
针对具有线性趋势的有限总体，提出不同超总体模型下的最优抽样策略，以无偏估计总体均值。
Postulating different superpopulation models for a finite population with linear trend, we suggest optimal sampling strategies for estimating the finite population mean within some classes of unbiased strategies.