On unbiased estimation of the population variance based on the stratified random sample (II)
Tài liệu tham khảo
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.