Calculating the M2 Model Fit Statistic for Diagnostic Classification Models R package dcm2 version 1.0.2 A collection of functions for calculating the M2 model fit statistic for diagnostic classification models as described by Liu et al. (2016) <DOI:10.3102/1076998615621293>. These functions provide multiple sources of information for model fit according to the M2 statistic, including the M2 statistic, the *p* value for that M2 statistic, and the Root Mean Square Error of Approximation based on the M2 statistic. Software Depends: R (>= 3.6) Imports: dplyr (>= 0.8.4), glue (>= 1.4.2), magrittr (>= 1.5), methods (>= 4.1.0), modelr (>= 0.1.8), purrr (>= 0.3.3), Rcpp, rlang (>= 0.4.11), stringr (>= 1.4.0), tibble (>= 2.1.3), tidyr (>= 1.1.4) LinkingTo: Rcpp, RcppArmadillo (>= 0.9.800.1.0) Suggests: covr, GDINA, roxygen2, spelling, testthat (>= 2.1.0) Jeffrey Hoover <jeffrey.c.hoover@gmail.com> Comprehensive R Archive Network (CRAN) Jeffrey Hoover [aut, cre, cph] (ORCID: <https://orcid.org/0000-0002-0276-0308>), W. Jake Thompson [aut] (ORCID: <https://orcid.org/0000-0001-7339-0300>), Wenchao Ma [ctb] (Author of Mord.cpp) GPL-3 2023-03-21 application/tgz https://CRAN.R-project.org/package=dcm2 doi:10.32614/CRAN.package.dcm2 en-US