A Note on Ordinary Least Squares Methods for Two-Stage Sampling
研究了两阶段抽样问题中的一类线性模型，证明普通最小二乘估计对此类模型是最优的，并指出某些参数的标准误的通常最小二乘估计是合适的。
Abstract A class of linear models for two-stage sampling problems is considered. Ordinary least squares estimates are optimal for these models. For some parameters the usual least squares estimates of standard errors are shown to be appropriate.