The significance of the difference between two means when the population variances are unequal
成果类型：
Article
署名作者：
Welch, BL
刊物名称：
BIOMETRIKA
ISSN/ISSBN：
0006-3444
DOI：
10.2307/2332010
发表日期：
1938
页码：
350362
关键词：
摘要：
Three methods of testing whether 2 means differ significantly are discussed, (i) The t test, appropriate when the 2 population variances are equal, may sometimes be misleading if these variances are unequal. (ii) A similar test, based on 2 separate estimates of the population variances, is less liable to bias. (iii) A test proposed from considerations of fiducial probability does not appear to be valid. The comparison of regressions is considered from the same points of view.
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