Computing Power and Sample Size for the False Discovery Rate in Multiple Applications R package FDRsamplesize2 version 0.2.0 Defines a collection of functions to compute average power and sample size for studies that use the false discovery rate as the final measure of statistical significance. A three-rectangle approximation method of a p-value histogram is proposed to derive a formula to compute the statistical power for analyses that involve the FDR. The methodology paper of this package is under review. Software Suggests: testthat (>= 3.0.0) Yonghui Ni <Yonghui.Ni@STJUDE.ORG> Comprehensive R Archive Network (CRAN) Yonghui Ni [aut, cre], Stanley Pounds [aut] MIT + file LICENSE (https://CRAN.R-project.org/package=FDRsamplesize2/LICENSE) 2024-02-27 application/tgz https://CRAN.R-project.org/package=FDRsamplesize2 doi:10.32614/CRAN.package.FDRsamplesize2