References
Wakimoto, K. (1970). On unbiased estimation of the population variance based on the stratified random sample,Ann. Inst. Statist. Math.,22, 15–26.
Fraser, D. A. S. (1957).Nonparametric Methods in Statistics, John Wiley.
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Wakimoto, K. On unbiased estimation of the population variance based on the stratified random sample (II). Ann Inst Stat Math 22, 429–433 (1970). https://doi.org/10.1007/BF02506361
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DOI: https://doi.org/10.1007/BF02506361