𝔖 Bobbio Scriptorium
✦   LIBER   ✦

S11 Internal estimation of the sample size for a t-test

✍ Scribed by Jonathan S. Denne

Book ID
113298411
Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
74 KB
Volume
17
Category
Article
ISSN
0197-2456

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If the sample size for a t-test is calculated on the basis of a prior estimate of the variance then the power of the test at the treatment di!erence of interest is not robust to misspeci"cation of the variance. We propose a t-test for a two-treatment comparison based on Stein's two-stage test which

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## Abstract The ratio of subjects to variables (__N/p__), as a rule to calculate the sample size required in internal validity studies on measurement scales, has been recommended without any strict theoretical or empirical basis being provided. The purpose of the present study was to develop a tool