Hierarchical Multinomial Processing Tree Modeling R package TreeBUGS version 1.5.3 CRAN Task View: Psychometrics (https://CRAN.R-project.org/view=Psychometrics) User-friendly analysis of hierarchical multinomial processing tree (MPT) models that are often used in cognitive psychology. Implements the latent-trait MPT approach (Klauer, 2010) <DOI:10.1007/s11336-009-9141-0> and the beta-MPT approach (Smith & Batchelder, 2010) <DOI:10.1016/j.jmp.2009.06.007> to model heterogeneity of participants. MPT models are conveniently specified by an .eqn-file as used by other MPT software and data are provided by a .csv-file or directly in R. Models are either fitted by calling JAGS or by an MPT-tailored Gibbs sampler in C++ (only for nonhierarchical and beta MPT models). Provides tests of heterogeneity and MPT-tailored summaries and plotting functions. A detailed documentation is available in Heck, Arnold, & Arnold (2018) <DOI:10.3758/s13428-017-0869-7> and a tutorial on MPT modeling can be found in Schmidt, Erdfelder, & Heck (2023) <DOI:10.1037/met0000561>. Software Depends: R (>= 4.0.0) Imports: Rcpp (>= 1.0.0), stats, parallel, graphics, utils, grDevices, MASS, runjags, rjags, coda, hypergeo, logspline LinkingTo: Rcpp, RcppArmadillo Suggests: knitr, rmarkdown, testthat, R.rsp Daniel W. Heck <daniel.heck@uni-marburg.de> Comprehensive R Archive Network (CRAN) Daniel W. Heck [aut, cre] (ORCID: <https://orcid.org/0000-0002-6302-9252>), Nina R. Arnold [aut, dtc], Denis Arnold [aut], Alexander Ly [ctb], Marius Barth [ctb] (ORCID: <https://orcid.org/0000-0002-3421-6665>) GPL-3 2025-09-23 application/tgz https://CRAN.R-project.org/package=TreeBUGS doi:10.32614/CRAN.package.TreeBUGS