https://github.com/cran/bayestestR
Revision 85d0a0463621c30063752c5577e591be0de5ae60 authored by Dominique Makowski on 26 July 2021, 08:40:08 UTC, committed by cran-robot on 26 July 2021, 08:40:08 UTC
1 parent 601edcd
Tip revision: 85d0a0463621c30063752c5577e591be0de5ae60 authored by Dominique Makowski on 26 July 2021, 08:40:08 UTC
version 0.10.5
version 0.10.5
Tip revision: 85d0a04
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}
\alias{rope_range.default}
\title{Find Default Equivalence (ROPE) Region Bounds}
\usage{
rope_range(x, ...)
\method{rope_range}{default}(x, verbose = TRUE, ...)
}
\arguments{
\item{x}{A \code{stanreg}, \code{brmsfit} or \code{BFBayesFactor} object.}
\item{...}{Currently not used.}
\item{verbose}{Toggle warnings.}
}
\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{π/√(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 models from \strong{count data}, the residual variance is used.
This is a rather experimental threshold and is probably often similar to
\code{-0.1, 0.1}, but should be used with care!
\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", refresh = 0)
rope_range(model)
}
if (require("brms")) {
model <- brm(mpg ~ wt + cyl, data = mtcars)
rope_range(model)
}
if (require("BayesFactor")) {
model <- ttestBF(mtcars[mtcars$vs == 1, "mpg"], mtcars[mtcars$vs == 0, "mpg"])
rope_range(model)
model <- lmBF(mpg ~ vs, data = mtcars)
rope_range(model)
}
}
}
\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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