Methods for Cross-Cultural Psychology R package ccpsyc version 0.2.8 Combines multiple functions that automate and simplify methods commonly employed in cross-cultural psychology, providing a unified analysis approach for measurement invariance testing, effect sizes for differential item functioning, factor congruence and multi-group reliability. Methods follow Fischer and Karl (2019) <doi:10.3389/fpsyg.2019.01507> and Gunn, Grimm and Edwards (2020) <doi:10.1080/10705511.2019.1689507>. Software Depends: R (>= 4.0.0) Imports: dplyr, lavaan, magrittr, MCMCpack, psych, RcppAlgos, readr, stats, tibble, tidyr Suggests: knitr, readxl, rmarkdown, testthat (>= 3.0.0) Johannes Karl <johannes.a.karl@gmail.com> Comprehensive R Archive Network (CRAN) Johannes Karl [aut, cre] GPL-3 2026-07-24 application/tgz https://CRAN.R-project.org/package=ccpsyc doi:10.32614/CRAN.package.ccpsyc