This page describes some of the `R` packages for graphical modelling that I have been involved with. There are many more packages for grapical modelling, and the CRAN Task View Graphical Models lists many of these.

- Probability propagation in Bayesian networks (graphical independence networks).
- The reference to gRain is: Højsgaard, S. (2012) Graphical Independence Networks with the gRain Package for R. Journal of Statistical Software Vol. 46, No. 10. 1-26
- See also Højsgaard, Edwards, Lauritzen (2012) Graphical Modelling with R. Springers UseR! series.

- Graphical interaction models (graphical log-linear models for discrete data, Gaussian graphical models for continuous data and Mixed interaction models for mixed data).
- See Højsgaard, Edwards, Lauritzen (2012) Graphical Modelling with R. Springers UseR! series.

- Efficient graph algorithms, functions for easy creation of graphs, functions for manipulation of highdimensional tables, data relevant to graphical models.
- Many graph modelling packages depend on gRbase, but gRbase itself provides only limited modelling facilities.
- The reference to gRbase is: Dethlefsen, C., Højsgaard, S. (2005) A Common Platform for Graphical Models in R: The gRbase Package. Journal of Statistical Software Vol. 14, No. 17.

- Inference in Graphical Gaussian Models with Edge and Vertex Symmetries.
- The reference to gRc is: Højsgaard, S., Lauritzen, S. (2007) Inference in Graphical Gaussian Models with Edge and Vertex Symmetries with the gRc Package for R. Journal of Statistical Software, Vol. 23, No. 6, 2007.
- See also Højsgaard, S., Lauritzen, S. (2008) Graphical Gaussian models with edge and vertex symmetries. Journal of the Royal Statistical Society; Series B: Statistical Methodology, Vol. 70, No. 5, p. 1005-102

Development versions of the packages reside on github. To use these versions, PLEASE install the `CRAN` versions FIRST (see section on installation) to get dependencies right and then AFTERWARDS install the development versions using:

`remotes::install_github("hojsgaard/gRbase")`

Notice that for this to succeed you will need tools for building R packages from sources on your computer. For windows users this translates to that you will have to install Rtools. Just follow the suggestions of the installer.

Notice that the packages are interdependent: For example,

`gRain`depends on`gRbase`. Therefore, to use the development version of e.g.`gRain`you must (most likely) also install the development version of`gRbase`.

Højsgaard, Edwards, Lauritzen (2012) Graphical Modelling with R. Springers UseR! series. The book contains several illustrations of the use of the gRbase, gRain and gRim packages.

Errata list for Graphical Modelling with R.

See also Lauritzen (1996) Graphical Models. Oxford University Press

Q: Is it possible to specify likelihood evidence (also called virtual evidence) in

`gRain`?A: Yes, as of version 1.1-2 this has been implemented. The function to use is

`setEvidence()`. A vignette on the topic has also been added.

Please report unexpected behaviour.Q: I want to build a Bayesian network with 80.000 nodes. Can I do so with

`gRain`?A: Work has been done on supporting large networks. Please report sucesses and failures.

Q: Does

`gRain`have support for Bayesian networks for variables that are (multivariate) normal? Or for mixtures of discrete and normal variables?A: No. Implementation for the multivariate normal distribution is - at least in principle - straight forward although there can non-trivial numerical issues.

Q: Does

`gRain`have support for Bayesian networks for variables that are not discrete (and with a finite state space)?A: Not in full generality. However, using the likelihood evidence facilities, one can work with some types of non-discrete variables.

When reporting unexpected behaviours, bugs etc. PLEASE supply:

A small reproducible example in terms of a short code fragment.

The data. The preferred way of sending the data “mydata” is to copy and paste the result from running

`dput(mydata)`.The result of running the

`sessionInfo()`function.