varian is a free, open source
R package for variability
analysis using Bayesian inference.
It provides a formula interface in
R to define a multilevel model
for a variable with repeated measures, in addition to standard
multilevel features such as fixed effects and a random
intercepts/slopes, the residual variance is a random variable by
ID. The latent residual variance estimates are then used as
predictors in a regression of another outcome.
At its core,
Stan to estimate the
R version 3.3.0 or later is required. You can download the latest
Stan and the
varian package rely on being able to compile
- For Windows, download and install Rtools at http://cran.r-project.org/bin/windows/Rtools/
- For Mac, make sure you have the latest version of Xcode installed.
The installation instructions for
rstanprovide more details.
- For Linux, make sure you have a recent version of g++ or clang++.
Install the latest version of the
package (should happen automatically from CRAN now). That page also
lists more detailed directions for getting the necessary tools
You can install:
the latest stable release from CRAN
install.packages("varian", dependencies = TRUE)
the latest development version from github
Learn about the theory
See our open access pre-print on the arXiv http://arxiv.org/abs/1411.2961.