๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Sample size formula with a continuous outcome for unequal group sizes and unequal variances

โœ Scribed by Hubert J. A. Schouten

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
70 KB
Volume
18
Category
Article
ISSN
0277-6715

No coin nor oath required. For personal study only.

โœฆ Synopsis

Guenther derived a simple formula for the accurate computation of equal sample sizes when the two-sample t-test with pooled variance estimate is used. In the present paper, the Guenther formula is generalized to the case of unequal sample sizes. In addition, the case of unequal variances is considered.

๐Ÿ“œ SIMILAR VOLUMES

A Robust Test for Multi-Sample Location
A Robust Test for Multi-Sample Location Problems with Unequal Group Variances and Nonnormality
โœ Dr. M. A. Tabatabai; US W. Y. Tan ๐Ÿ“‚ Article ๐Ÿ“… 1988 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 283 KB ๐Ÿ‘ 2 views

## Sunmn y A robust test (to be referred to as Y\* test) is proposed for W i n g equality of several group means without assuming normality> and equality of variances. This test statistic ie obtained by combining Tiku's MML robust procedure with the James statistic. Monte Carlo simulation studies

Planning group sizes in clinical trials
Planning group sizes in clinical trials with a continuous outcome and repeated measures
โœ Hubert J. A. Schouten ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 119 KB ๐Ÿ‘ 2 views

Simple formulae have been derived for the accurate computation of sample sizes when the two-sample t-test is used. Required sample sizes may be reduced by taking repeated measures, especially if correlations are about equal. In a trial with two parallel groups, repeated measures may be summarized by