Package: fibr
Type: Package
Title: Prior-Fraction Diagnostics for Hierarchical Models
Version: 0.1.1
Authors@R: 
    person("Aidan D", "Bindoff",
           email   = "aidan.bindoff@utas.edu.au",
           role    = c("aut", "cre"),
           comment = c(ORCID = "0000-0002-0943-2702"))
Description: Computes the prior fraction, the per-group pooling or
        shrinkage factor, for hierarchical models, including directly
        from 'brms' fits. For each group-level coefficient the prior
        fraction is the share of the posterior precision contributed by
        the shrinkage prior relative to the likelihood; values near one
        indicate a coefficient that is prior-dominated (the
        centring/non-centring funnel regime), values near zero indicate
        a likelihood-dominated coefficient that is well identified from
        the data. These quantities are invisible to standard
        convergence diagnostics such as R-hat and effective sample
        size, and they indicate where a non-centred reparameterisation
        is likely to help. A companion advisor reports the same
        decomposition for changepoint random effects fitted with
        'smoothbp'. The underlying geometry (the Fisher-metric
        connection on the base-fiber split, for which this connection
        is flat so the obstruction is statistical rather than
        geometric) is described in Bindoff (2026)
        <doi:10.5281/zenodo.20724550>; code reproducing the paper is in
        the package's source repository.
License: MIT + file LICENSE
URL: https://github.com/ABindoff/fibr,
        https://doi.org/10.5281/zenodo.20724550
BugReports: https://github.com/ABindoff/fibr/issues
Encoding: UTF-8
RoxygenNote: 7.3.3
Depends: R (>= 4.1.0)
Imports: posterior (>= 1.4.0), ggplot2
Suggests: brms, smoothbp, cmdstanr, testthat (>= 3.0.0)
Additional_repositories: https://stan-dev.r-universe.dev
Config/testthat/edition: 3
Config/rextendr/version: 0.5.0
SystemRequirements: Cargo (Rust's package manager), rustc >= 1.65.0, xz
NeedsCompilation: no
Packaged: 2026-06-29 15:00:43 UTC; root
Author: Aidan D Bindoff [aut, cre] (ORCID:
        <https://orcid.org/0000-0002-0943-2702>)
Maintainer: Aidan D Bindoff <aidan.bindoff@utas.edu.au>
Config/pak/sysreqs: xz-utils libclang-dev
Repository: https://cran.r-universe.dev
Date/Publication: 2026-06-29 14:31:03 UTC
RemoteUrl: https://github.com/cran/fibr
RemoteRef: HEAD
RemoteSha: 83c8634cd610785ce2bc8cc4e6e887ad29c7185a