Abstract
A two-stage procedure based on the statistic introduced by Scheffé (1943) to solve the Behrens-Fisher problem is considered in estimating the difference between the mean values of two normal distributions having unequal and unknown variances. Samples of unequal size are considered at each stage. A numerical example is given where the two-stage procedure is compared with the Satterthwaite (1946) approximate method.
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Targhetta, M.L. A two-stage sampling by unequal size samples from two normal populations with unknown variances. Metrika 45, 31–37 (1997). https://doi.org/10.1007/BF02717091
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DOI: https://doi.org/10.1007/BF02717091