Package: underdisp
Type: Package
Title: Diagnostics and Models for Underdispersed Count Data
Version: 0.1.2
Authors@R: person("Benjamin E.", "Bagozzi", email = "bagozzib@udel.edu",
    role = c("aut", "cre"), comment = c(ORCID = "0000-0002-6233-6453"))
Description: Tools for detecting and modeling underdispersion in count
        data (conditional variance below the conditional mean), the
        case the Poisson and negative binomial defaults cannot
        represent. Provides a screening diagnostic that benchmarks
        at-risk dispersion against a zero-truncated Poisson,
        regression-adjusted tests of equidispersion, and a dispersion
        profile that compares the variance-to-mean curves of competing
        families against the data; the continuous parameter binomial
        (CPB) and generalized event count (Katz) regressions with
        zero-truncated, hurdle, and zero-inflated forms and
        high-dimensional fixed effects with a split-panel jackknife
        bias correction; matched Poisson, negative binomial,
        COM-Poisson (rate- and mean-parameterized), generalized
        Poisson, gamma-count, and double Poisson regressions through
        the same interface, with frequency weights, offsets, and
        analytic, robust, and cluster-robust standard errors; bootstrap
        and profile-likelihood inference; proper scoring rules,
        rootograms, PIT histograms, and simulation methods; and
        quantities of interest including predicted distributions, the
        implied ceiling, rate ratios, and first differences with an
        extensive/intensive decomposition. The likelihoods are
        implemented in C++.
License: GPL-3
Encoding: UTF-8
LazyData: true
Depends: R (>= 4.0)
Imports: Rcpp, stats, MASS, VGAM, graphics, methods, numDeriv, parallel
LinkingTo: Rcpp
Suggests: sandwich, pscl, DHARMa, testthat (>= 3.0.0), knitr,
        rmarkdown, broom, modelsummary, texreg, gamlss.dist, rmutil,
        glmmTMB, COMPoissonReg, Ecdat, wooldridge
VignetteBuilder: knitr
RoxygenNote: 7.3.3
Roxygen: list(markdown = TRUE, load = "source")
URL: https://CRAN.R-project.org/package=underdisp,
        https://github.com/bagozzib/underdisp,
        https://bagozzib.github.io/underdisp/
BugReports: https://github.com/bagozzib/underdisp/issues
Config/testthat/edition: 3
Repository: https://bagozzib.r-universe.dev
Date/Publication: 2026-09-30 19:18:01 UTC
RemoteUrl: https://github.com/bagozzib/underdisp
RemoteRef: HEAD
RemoteSha: 57c08fe0705a4f3b7c13eaf68c599a5d7ecfb530
NeedsCompilation: yes
Packaged: 2026-10-01 00:22:31 UTC; root
Author: Benjamin E. Bagozzi [aut, cre] (ORCID:
    <https://orcid.org/0000-0002-6233-6453>)
Maintainer: Benjamin E. Bagozzi <bagozzib@udel.edu>