samplesize-package {samplesize}

Computes sample size for several two-sample tests

Description

Computes sample size for independent and paired Student's t-test, Student's t-test with Welch-approximation, Wilcoxon-Mann-Whitney test with and without ties on ordinal data

Details

Package:	samplesize
Type:	Package
Version:	0.2-4
Date:	2016-12-22
License:	GPL (>=2)
LazyLoad:	yes

n.ttest(): sample size for Student's t-test and t-test with Welch approximation

n.wilcox.ord(): sample size for Wilcoxon-Mann-Whitney test with and without ties

Author(s)

Ralph Scherer

Maintainer: Ralph Scherer <[e-mail]>

References

Bock J., Bestimmung des Stichprobenumfangs fuer biologische Experimente und kontrollierte klinische Studien. Oldenbourg 1998

Zhao YD, Rahardja D, Qu Yongming. Sample size calculation for the Wilcoxon-Mann-Whitney test adjusting for ties. Statistics in Medicine 2008; 27:462-468