https://github.com/cran/bayestestR
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Tip revision: 645c10f110efae44c5ac60025664cd27f2b46a87 authored by Dominique Makowski on 26 March 2020, 05:10 UTC
version 0.5.3
Tip revision: 645c10f
rope_range.Rd
% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/rope_range.R
\name{rope_range}
\alias{rope_range}
\title{Find Default Equivalence (ROPE) Region Bounds}
\usage{
rope_range(x, ...)
}
\arguments{
\item{x}{A \code{stanreg}, \code{brmsfit} or \code{BFBayesFactor} object.}

\item{...}{Currently not used.}
}
\description{
This function attempts at automatically finding suitable "default"
  values for the Region Of Practical Equivalence (ROPE).
}
\details{
\cite{Kruschke (2018)} suggests that the region of practical
  equivalence could be set, by default, to a range from \code{-0.1} to
  \code{0.1} of a standardized parameter (negligible effect size
  according to Cohen, 1988).

  \itemize{
    \item For \strong{linear models (lm)}, this can be generalised to \ifelse{html}{\out{-0.1 * SD<sub>y</sub>, 0.1 * SD<sub>y</sub>}}{\eqn{[-0.1*SD_{y}, 0.1*SD_{y}]}}.
    \item For \strong{logistic models}, the parameters expressed in log odds ratio can be converted to standardized difference through the formula \ifelse{html}{\out{&pi;/&radic;(3)}}{\eqn{\pi/\sqrt{3}}}, resulting in a range of \code{-0.18} to \code{0.18}.
    \item For other models with \strong{binary outcome}, it is strongly recommended to manually specify the rope argument. Currently, the same default is applied that for logistic models.
    \item For \strong{t-tests}, the standard deviation of the response is used, similarly to linear models (see above).
    \item For \strong{correlations}, \code{-0.05, 0.05} is used, i.e., half the value of a negligible correlation as suggested by Cohen's (1988) rules of thumb.
    \item For all other models, \code{-0.1, 0.1} is used to determine the ROPE limits, but it is strongly advised to specify it manually.
  }
}
\examples{
\dontrun{
if (require("rstanarm")) {
  model <- stan_glm(
    mpg ~ wt + gear,
    data = mtcars,
    chains = 2,
    iter = 200,
    refresh = 0
  )
  rope_range(model)

  model <- stan_glm(vs ~ mpg, data = mtcars, family = "binomial")
  rope_range(model)
}

if (require("brms")) {
  model <- brm(mpg ~ wt + cyl, data = mtcars)
  rope_range(model)
}

if (require("BayesFactor")) {
  bf <- ttestBF(x = rnorm(100, 1, 1))
  rope_range(bf)
}
}
}
\references{
Kruschke, J. K. (2018). Rejecting or accepting parameter values in Bayesian estimation. Advances in Methods and Practices in Psychological Science, 1(2), 270-280. \doi{10.1177/2515245918771304}.
}
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