Literaturnachweis - Detailanzeige
| Autor/inn/en | Kohr, Richard L.; Games, Paul A. |
|---|---|
| Titel | [Procedures for Testing Differences Between Means in the Presence of Unequal N's and Variances]. |
| Quelle | (1974), (19 Seiten)
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| Dokumenttyp | gedruckt; online; Monographie |
| Schlagwörter | Hypothesis Testing; Probability; Sampling; Statistical Analysis; Statistical Significance |
| Abstract | An empirical sampling study investigated six procedures for testing differences between means in the presence of unequal n's and variances. Support was obtained for previous research which found t robust to heterogeneous variances only when n's are equal and of moderate size. The procedure which emerged as providing the best control over Type I errors while maintaining satisfactory power in all test conditions was the Behrens-Fisher v statistic with Welch's solution for degrees of freedom (df). The general recommendations when the population variances are unknown are: (1) when n's are the same and equal to or greater than 20 it is permissible to use the t statistic with df = 2n - 2, but when n is less than 20 use v with Welch's solution for df; (2) when n's are unequal use the v statistic with the Welch adjustment for df. (Author) |
| Erfasst von | ERIC (Education Resources Information Center), Washington, DC |
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