Variability Analysis in R

Uses a Bayesian model to estimate the variability in a repeated measure outcome and use that as an outcome or a predictor in a second stage model.


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, varian uses Stan to estimate the models.

R version 3.1.1 or later is required. You can download the latest version of R here:

http://www.r-project.org/

Stan and the varian package rely on being able to compile C++ code.

  • 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 rstan provide more details.
  • For Linux, make sure you have a recent version of ge++ or clang++.

Install the latest version of the rstan package, which you can do from CRAN now. That page also lists more detailed directions for getting the necessary tools installed.

```R
install.packages("rstan", dependencies = TRUE)
```

You can install:

  • the latest stable release (0.2.2) from CRAN

    install.packages("varian", dependencies = TRUE)
  • the latest development version from github

    install.packages("devtools")
    devtools::install_github("ElkhartGroup/varian")

See our open access pre-print on the arXiv http://arxiv.org/abs/1411.2961.

More

  • If you find a bug or have a feature request, please let us know on the issue tracker: https://github.com/ElkhartGroup/varian/issues.

  • Have questions or need support? Email us at info@elkhartgroup.com and mention "varian" in the subject.

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Reference manual

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install.packages("varian")

0.2.2 by Joshua F. Wiley, 2 years ago


https://github.com/ElkhartGroup/varian


Report a bug at https://github.com/ElkhartGroup/varian/issues


Browse source code at https://github.com/cran/varian


Authors: Joshua F. Wiley [aut, cre], Elkhart Group Limited [cph]


Documentation:   PDF Manual  


MIT + file LICENSE license


Imports stats, MASS, Formula, grid, gridExtra

Depends on rstan, ggplot2

Suggests testthat


See at CRAN