#' Get *p*-Value from 'lm' Object
#'
#' @description
#' Retrieve the *p*-value associated with a univariate linear regression.
#'
#' @param mod An object of class `lm`.
#'
#' @return
#' A `numeric` *p*-value.
#'
#' @source
#' [retrieving p-values in lm](https://stat.ethz.ch/pipermail/r-help/2005-December/084308.html)
#' on R-help mailing list.
#'
#' @seealso
#' [stats::lm()].
#'
#' @examples
#' ## taken from ?lm
#' ctl <- c(4.17,5.58,5.18,6.11,4.50,4.61,5.17,4.53,5.33,5.14)
#' trt <- c(4.81,4.17,4.41,3.59,5.87,3.83,6.03,4.89,4.32,4.69)
#' group <- gl(2, 10, 20, labels = c("Ctl","Trt"))
#' weight <- c(ctl, trt)
#' lm.D9 <- lm(weight ~ group)
#'
#' pvalue(lm.D9)
#'
#' @export
pvalue <- function(mod) {
mod_sum <- summary(mod)
coef(mod_sum)[2, 4]
}
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