You can generate random Bayes nets and data sets using
`weka.classifiers.bayes.net.BayesNetGenerator`

The options are:

-B Generate network (instead of instances) -N <integer> Nr of nodes -A <integer> Nr of arcs -M <integer> Nr of instances -C <integer> Cardinality of the variables -S <integer> Seed for random number generator -F <file> The BIF file to obtain the structure from.

The network structure is generated by first generating a tree so that we can ensure that we have a connected graph. If any more arrows are specified they are randomly added.

Remco Bouckaert 2008-05-12