Estimation of a Variety of Count Regression Models R package flexCountReg version 0.1.1 An implementation of multiple regression models for count data. These include various forms of the negative binomial (NB-1, NB-2, NB-P, generalized negative binomial, etc.), Poisson-Lognormal, other compound Poisson distributions, the Generalized Waring model, etc. Information on the different forms of the negative binomial are described by Greene (2008) <doi:10.1016/j.econlet.2007.10.015>. For treatises on count models, see Cameron and Trivedi (2013) <doi:10.1017/CBO9781139013567> and Hilbe (2012) <doi:10.1017/CBO9780511973420>. For the implementation of under-reporting in count models, see Wood et al. (2016) <doi:10.1016/j.aap.2016.06.013>. For prediction methods in random parameter models, see Wood and Gayah (2025) <doi:10.1016/j.aap.2025.108147>. For estimating random parameters using maximum simulated likelihood, see Greene and Hill (2010) <doi:10.1108/S0731-9053(2010)26>; Gourieroux and Monfort (1996) <doi:10.1093/0198774753.001.0001>; or Hensher et al. (2015) <doi:10.1017/CBO9781316136232>. Software Depends: R (>= 4.1.0) Imports: broom, cureplots, gsl, gt, knitr, MASS, maxLik, methods, modelr, purrr, randtoolbox, Rcpp (>= 1.0.12), rlang, sandwich, stats, dplyr, stringr, tibble, tidyr, truncnorm, utils LinkingTo: Rcpp Suggests: spelling, lamW, testthat (>= 3.0.0) Jonathan Wood <jwood2@iastate.edu> Comprehensive R Archive Network (CRAN) Jonathan Wood [aut, cre] (ORCID: <https://orcid.org/0000-0003-0131-6384>), Guillermo Basulto-Elias [aut] (ORCID: <https://orcid.org/0000-0002-5205-2190>) MIT + file LICENSE (https://CRAN.R-project.org/package=flexCountReg/LICENSE) 2026-01-19 application/tgz https://CRAN.R-project.org/package=flexCountReg doi:10.32614/CRAN.package.flexCountReg en-US