Improved Trimmed Weighted Hochberg Procedures and Sample Size Optimization R package itrimhoch version 1.0.0 The improved trimmed weighted Hochberg procedure provides increased statistical power and relaxes the dependence assumptions for familywise error rate control compared to the original weighted Hochberg procedure. This package computes the boundaries required for implementing the proposed methodology and includes sample size optimization methods. See Gou, J., Chang, Y., Li, T., and Zhang, F.(2025). Improved trimmed weighted Hochberg procedures with two endpoints and sample size optimization. Technical Report. Software Depends: R (>= 4.2.0) Imports: mvtnorm (>= 1.2), stats (>= 4.0.0) Jiangtao Gou <gouRpackage@gmail.com> Comprehensive R Archive Network (CRAN) Jiangtao Gou [aut, cre], Fengqing (Zoe) Zhang [aut], Yizhuo Chang [ctb], Tianqi Li [ctb] GPL-3 2025-04-24 application/tgz https://CRAN.R-project.org/package=itrimhoch doi:10.32614/CRAN.package.itrimhoch