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变异系数相同但未知的两个正态总体的极大似然估计AI 解读

Maximum likelihood estimates are derived for the parameters of two normal populations with coefficients of variation equal but unknown. Formulas are provided for calculating the asymptotic variances and covariances of the estimates. The relative efficiency of the proposed mean estimator with respect to the sample mean is shown to be greater than one. The effect of departures from the assumptions of normality and of equal coefficients of variation on this relative efficiency…

迁徙猎鸟调查的发展AI 解读

Estimates of kill and activity in Canadian mail surveys of migratory game birds have been subject to considerable survey errors. This article reviews the design of the surveys and describes the studies undertaken to estimate and correct for these errors. Recent developments in sampling and estimation procedures for these surveys are presented and changes in operational procedures described which have been adopted to implement these developments.

迁徙猎鸟调查的进展AI 解读

Estimates of kill and activity in Canadian mail surveys of migratory game birds have been subject to considerable survey errors. This article reviews the design of the surveys and describes the studies undertaken to estimate and correct for these errors. Recent developments in sampling and estimation procedures for these surveys are presented and changes in operational procedures described which have been adopted to implement these developments.

分层两阶段抽样方案的比较AI 解读

This paper deals with an empirical investigation of various stratified two-stage sampling systems for estimating totals of certain agricultural items of North Carolina. The 1940 Agricultural Census data were used for stratification, selection and estimation purposes. The observed data were the results of the 1945 Agricultural Census. Theory for the selection of n primary sampling units from a stratum with probability proportional to some measure of size but without…

分层两阶段抽样方案的比较AI 解读

This paper deals with an empirical investigation of various stratified two-stage sampling systems for estimating totals of certain agricultural items of North Carolina. The 1940 Agricultural Census data were used for stratification, selection and estimation purposes. The observed data were the results of the 1945 Agricultural Census. Theory for the selection of n primary sampling units from a stratum with probability proportional to some measure of size but without…