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入样概率与规模成比例的抽样方法
Most simple sampling procedures with inclusion probabilities proportional to size are available only for samples of size two. For some of the procedures with sample sizes more than two only asymptotic variances are commonly provided. We present a simple technique for inclusion probabilities proportional to size sampling which permits a considerable degree of flexibility.
纳入概率与规模成比例的抽样程序
Most simple sampling procedures with inclusion probabilities proportional to size are available only for samples of size two. For some of the procedures with sample sizes more than two only asymptotic variances are commonly provided. We present a simple technique for inclusion probabilities proportional to size sampling which permits a considerable degree of flexibility.
改进的系统抽样方法
In the presence of a linear trend in the population, a slight modification of the usual systematic sampling procedure is found to be highly effective in reducing the error variance of the estimator for the population mean. The efficiency of this modified design in the presence of certain trends, other than linear, such as ‘random’, ‘quadratic’ and ‘periodic’ trends, has been evaluated in comparison with usual systematic sampling methods. The adaptability and suitability of…
连续调查时点的分层双重抽样
A sampling procedure involving repeated application of double sampling for stratification on several successive occasions is considered. The formulae for the estimate of the mean on any current occasion and its variance are obtained. The determination of optimum allocation of available resources and the extension of the procedures for uni-stage sampling, to multi-stage sampling, are briefly indicated. The use of the design, suggested in this paper, is illustrated by its…