Data Analysis and Parameter Estimation Using Item Response Theory R package Rirt version 0.0.2 CRAN Task View: Psychometrics (https://CRAN.R-project.org/view=Psychometrics) Parameter estimation, computation of probability, information, and (log-)likelihood, and visualization of item/test characteristic curves and item/test information functions for three uni-dimensional item response theory models: the 3-parameter-logistic model, generalized partial credit model, and graded response model. The full documentation and tutorials are at <https://github.com/xluo11/Rirt>. Software Depends: R (>= 3.6.0) Imports: ggplot2, Rcpp, reshape2, stats LinkingTo: Rcpp Suggests: testthat Xiao Luo <xluo1986@gmail.com> Comprehensive R Archive Network (CRAN) Xiao Luo [aut, cre] GPL (>= 3) 2019-10-23 application/tgz https://CRAN.R-project.org/package=Rirt doi:10.32614/CRAN.package.Rirt