Sample Size Calculation for Various t-Tests and Wilcoxon-Test

Computes sample size for Student's t-test and for the Wilcoxon-Mann-Whitney test for categorical data. The t-test function allows paired and unpaired (balanced / unbalanced) designs as well as homogeneous and heterogeneous variances. The Wilcoxon function allows for ties.


To install the development version of the samplesize package, it is easiest to use the devtools package:

install.packages("devtools")  # if needed..
library(devtools)
install_github("samplesize", "shearer")
library(samplesize)

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Reference manual

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install.packages("samplesize")

0.2-4 by Ralph Scherer, 2 years ago


https://github.com/shearer/samplesize


Report a bug at https://github.com/shearer/samplesize/issues


Browse source code at https://github.com/cran/samplesize


Authors: Ralph Scherer


Documentation:   PDF Manual  


Task views: Clinical Trial Design, Monitoring, and Analysis


GPL (>= 2) license



See at CRAN