samplesize-package {samplesize} | R Documentation |
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
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
Ralph Scherer
Maintainer: Ralph Scherer <scherer.ralph@mh-hannover.de>
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