Marginalized Bayesian Item Parameter Estimation, 2pl Model IRT R package irtbem2pl version 1.0.0 Estimates item parameters of the two-parameter logistic (2PL) model in Item Response Theory (IRT) using the marginal Bayesian modal estimation via the Expectation-Maximization (EM) algorithm. The package calibrates item discrimination and difficulty parameters, yielding results comparable to software like 'BILOG-MG'. Software Depends: R (>= 3.5.0) Imports: IRTBEMM Juan Luis Legorreta Torres <jlegorreta2002@yahoo.com.mx> Comprehensive R Archive Network (CRAN) Juan Luis Legorreta Torres [aut, cre] GPL (>= 2) 2026-06-08 application/tgz https://CRAN.R-project.org/package=irtbem2pl doi:10.32614/CRAN.package.irtbem2pl en-US