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Stratified Sampling and Distribution-Free Confidence Intervals for a Median

 

作者: PhilipJ. McCarthy,  

 

期刊: Journal of the American Statistical Association  (Taylor Available online 1965)
卷期: Volume 60, issue 311  

页码: 772-783

 

ISSN:0162-1459

 

年代: 1965

 

DOI:10.1080/01621459.1965.10480826

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

This paper presents the results of a limited investigation which brings into focus the difficulties encountered in developing exact distribution-free methods for stratified simple random sampling. It is shown that exact distribution-free confidence intervals for a population median can be obtained from a stratified sample under very special circumstances. The principal result concerns the order statistics of the combined separate strata samples, where proportional allocation is employed. It is proved that a pair of symmetric order statistics provides a confidence interval for the population median whose confidence coefficient is not less than the confidence coefficient obtained from the corresponding order statistics of a random sample of the same total size drawn from the entire population. Furthermore, it is shown by means of a numerical example that this result necessarily holds only when proportional allocation is employed.

 

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