samplesize-package {samplesize}R Documentation

Computes sample size for Student's t-test, Student's t-test with Welch approximation and Wilcoxon-Mann-Whitney test on ordinal data

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: 0.1-6
Date: 2010-01-11
License: GPL (>=2)
LazyLoad: yes

n.paired.t.test(): sample size for paired Student's t-test

n.indep.t.test.eq(): sample size for indepent Student's t-test with equal group size

n.indep.t.test.neq(): sample size for indepent Student's t-test with different group size

n.welch.test(): sample size for Student's 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 <scherer.ralph@mh-hannover.de>

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


[Package samplesize version 0.1-6 Index]