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Tip revision: **d73e4a2afcfbd6402c11716877e8f7466f309ef4** authored by ** Dominique Makowski ** on **22 October 2020, 13:40:02 UTC**

**version 0.7.5**

Tip revision: **d73e4a2**

bayesfactor.Rd

```
% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/bayesfactor.R
\name{bayesfactor}
\alias{bayesfactor}
\title{Bayes Factors (BF)}
\usage{
bayesfactor(
...,
prior = NULL,
direction = "two-sided",
null = 0,
hypothesis = NULL,
effects = c("fixed", "random", "all"),
verbose = TRUE,
denominator = 1,
match_models = FALSE,
prior_odds = NULL
)
}
\arguments{
\item{...}{A numeric vector, model object(s), or the output from \code{bayesfactor_models}.}
\item{prior}{An object representing a prior distribution (see 'Details').}
\item{direction}{Test type (see 'Details'). One of \code{0}, \code{"two-sided"} (default, two tailed),
\code{-1}, \code{"left"} (left tailed) or \code{1}, \code{"right"} (right tailed).}
\item{null}{Value of the null, either a scalar (for point-null) or a range
(for a interval-null).}
\item{hypothesis}{A character vector specifying the restrictions as logical conditions (see examples below).}
\item{effects}{Should results for fixed effects, random effects or both be returned?
Only applies to mixed models. May be abbreviated.}
\item{verbose}{Toggle off warnings.}
\item{denominator}{Either an integer indicating which of the models to use as the denominator,
or a model to be used as a denominator. Ignored for \code{BFBayesFactor}.}
\item{match_models}{See details.}
\item{prior_odds}{Optional vector of prior odds for the models. See \code{BayesFactor::priorOdds<-}.}
}
\value{
Some type of Bayes factor, depending on the input. See \code{\link{bayesfactor_parameters}}, \code{\link{bayesfactor_models}} or \code{\link{bayesfactor_inclusion}}
}
\description{
This function compte the Bayes factors (BFs) that are appropriate to the input.
For vectors or single models, it will compute \code{\link[=bayesfactor_parameters]{BFs for single parameters}},
or is \code{hypothesis} is specified, \code{\link[=bayesfactor_restricted]{BFs for restricted models}}.
For multiple models, it will return the BF corresponding to \code{\link[=bayesfactor_models]{comparison between models}}
and if a model comparison is passed, it will compute the \code{\link[=bayesfactor_inclusion]{inclusion BF}}.
\cr\cr
For a complete overview of these functions, read the \href{https://easystats.github.io/bayestestR/articles/bayes_factors.html}{Bayes factor vignette}.
}
\note{
There is also a \href{https://easystats.github.io/see/articles/bayestestR.html}{\code{plot()}-method} implemented in the \href{https://easystats.github.io/see/}{\pkg{see}-package}.
}
\examples{
library(bayestestR)
# Vectors
prior <- distribution_normal(1000, mean = 0, sd = 1)
posterior <- distribution_normal(1000, mean = .5, sd = .3)
bayesfactor(posterior, prior = prior)
\dontrun{
# rstanarm models
# ---------------
if (require("rstanarm")) {
model <- stan_lmer(extra ~ group + (1 | ID), data = sleep)
bayesfactor(model)
}
}
# Frequentist models
# ---------------
m0 <- lm(extra ~ 1, data = sleep)
m1 <- lm(extra ~ group, data = sleep)
m2 <- lm(extra ~ group + ID, data = sleep)
comparison <- bayesfactor(m0, m1, m2)
comparison
bayesfactor(comparison)
}
```