Power Analysis for IRT Models Using the Wald, LR, Score, and Gradient Statistics R package irtpwr version 1.0.3 Implementation of analytical and sampling-based power analyses for the Wald, likelihood ratio (LR), score, and gradient tests. Can be applied to item response theory (IRT) models that are fitted using marginal maximum likelihood estimation. The methods are described in our paper (Zimmer et al. (2022) <doi:10.1007/s11336-022-09883-5>). Software Imports: mirt, Deriv, digest, spatstat.random, ggplot2, methods Suggests: testthat, knitr, rmarkdown Felix Zimmer <felix.zimmer@mail.de> Comprehensive R Archive Network (CRAN) Felix Zimmer [aut, cre] (ORCID: <https://orcid.org/0000-0002-8127-0007>), Rudolf Debelak [aut] (ORCID: <https://orcid.org/0000-0001-8900-2106>), Jan Radek [ctb] GPL (>= 3) 2023-11-20 application/tgz https://CRAN.R-project.org/package=irtpwr doi:10.32614/CRAN.package.irtpwr