R/report.BFBayesFactor.R

In report: Automated Reporting of Results and Statistical Models

#' Reporting `BFBayesFactor` objects from the `BayesFactor` package
#'
#' Interpretation of the Bayes factor output from the `BayesFactor` package.
#'
#' @param x An object of class `BFBayesFactor`.
#' @param h0,h1 Names of the null and alternative hypotheses.
#' @param table A `parameters` table (this argument is meant for internal use).
#' @param ... Other arguments to be passed to [effectsize::interpret_bf] and [insight::format_bf].
#'
#' @examplesIf requireNamespace("BayesFactor", quietly = TRUE)
#' \donttest{
#' library(BayesFactor)
#'
#' rez <- BayesFactor::ttestBF(iris$Sepal.Width, iris$Sepal.Length)
#' report_statistics(rez, exact = TRUE) # Print exact BF
#' report(rez, h0 = "the null hypothesis", h1 = "the alternative")
#'
#' rez <- BayesFactor::correlationBF(iris$Sepal.Width, iris$Sepal.Length)
#' report(rez)
#' }
#'
#' @export
report.BFBayesFactor <- function(x, h0 = "H0", h1 = "H1", ...) {
  if (inherits("BFlinearModel", class(x@numerator[[1]]))) {
    return(report(bayestestR::bayesfactor_models(x), ...))
  }

  if (length(x@numerator) > 1) {
    insight::format_alert(
      "Multiple `BFBayesFactor` models detected - reporting for the first numerator model.",
      "See help(\"get_parameters\", package = \"insight\")."
    )
    x <- x[1]
  }

  param <- parameters::parameters(x[1], ...)
  bf <- param$BF
  other_dir <- ifelse(bf < 1, "h0", "h1")


  if (other_dir == "h1") {
    other_text <- paste0(
      "There is ",
      effectsize::interpret_bf(bf, ...),
      " ",
      h1,
      " over ",
      h0,
      " (", report_statistics(x, ...), ")."
    )
  } else {
    other_text <- paste0(
      "There is ",
      effectsize::interpret_bf(1 / bf, ...),
      " ",
      h0,
      " over ",
      h1,
      " (", report_statistics(x, ...), ")."
    )
  }
  other_text
}



#' @rdname report.BFBayesFactor
#' @export
report_statistics.BFBayesFactor <- function(x, table = NULL, ...) {
  if (is.null(table)) {
    if (length(x@numerator) > 1) {
      insight::format_alert(
        "Multiple `BFBayesFactor` models detected - reporting for the first numerator model.",
        "See help(\"get_parameters\", package = \"insight\")."
      )
      x <- x[1]
    }
    table <- parameters::parameters(x, ...)
  }

  bf <- table$BF
  other_text <- ifelse(bf < 1,
    insight::format_bf(1 / bf, name = "BF01", ...),
    insight::format_bf(bf, name = "BF10", ...)
  )
  other_text
}