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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Welch's t test ： ウィキペディア英語版 Welch's t test In statistics, Welch's ''t''-test (or unequal variances ''t''-test) is a two-sample location test, and is used to test the hypothesis that two populations have equal means. Welch's ''t''-test is an adaptation of Student's ''t''-test, and is more reliable when the two samples have unequal variances and unequal sample sizes. These tests are often referred to as "unpaired" or "independent samples" t-tests, as they are typically applied when the statistical units underlying the two samples being compared are non-overlapping. Given that Welch's ''t''-test has been less popular than Student's ''t''-test〔 and may be less familiar to readers, a more informative name is "Welch's unequal variances ''t''-test" or "unequal variances ''t''-test" for brevity. ==Assumptions== Student's ''t''-test assumes that the two populations have normal distributions and with equal variances. Welch's ''t''-test is designed for unequal variances, but the assumption of normality is maintained.〔 Welch's ''t''-test is an approximate solution to the Behrens-Fisher problem. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Welch's t test」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.