R/gam.R

In tidymodels/broom: Convert Statistical Objects into Tidy Tibbles

#' @templateVar class Gam
#' @template title_desc_tidy
#'
#' @param x A `Gam` object returned from a call to [gam::gam()].
#' @template param_unused_dots
#'
#' @evalRd return_tidy(
#'   "term",
#'   "df",
#'   "sumsq",
#'   "meansq",
#'   "statistic",
#'   "p.value"
#' )
#'
#' @details Tidy `gam` objects created by calls to [mgcv::gam()] with
#'   [tidy.gam()].
#'
#' @examplesIf rlang::is_installed("gam")
#'
#' # load libraries for models and data
#' library(gam)
#'
#' # fit model
#' g <- gam(mpg ~ s(hp, 4) + am + qsec, data = mtcars)
#'
#' # summarize model fit with tidiers
#' tidy(g)
#' glance(g)
#'
#' @export
#' @family gam tidiers
#' @aliases Gam_tidiers
#' @seealso [tidy()], [gam::gam()], [tidy.anova()], [tidy.gam()]
#' @rdname tidy_gam_hastie
tidy.Gam <- function(x, ...) {
  tidy(summary(x)$parametric.anova)
}

#' @templateVar class Gam
#' @template title_desc_glance
#'
#' @inheritParams tidy.Gam
#'
#' @evalRd return_glance(
#'   "df",
#'   "logLik",
#'   "AIC",
#'   "BIC",
#'   "deviance",
#'   "df.residual",
#'   "nobs"
#' )
#'
#' @details Glance at `gam` objects created by calls to [mgcv::gam()] with
#'   [glance.gam()].
#'
#' @family gam tidiers
#' @export
#' @seealso [glance()], [gam::gam()]
#' @rdname glance_gam_hastie
glance.Gam <- function(x, ...) {
  s <- summary(x)

  as_glance_tibble(
    df = s$df[1],
    logLik = as.numeric(stats::logLik(x)),
    AIC = stats::AIC(x),
    BIC = stats::BIC(x),
    deviance = stats::deviance(x),
    df.residual = stats::df.residual(x),
    nobs = stats::nobs(x),
    na_types = "irrrrii"
  )
}