[R] bnlearn and TAN network

[ross.chapman at ecogeonomix.com]

Hi all,

 

I have created a TAN network using bnlearn in R using the commands:

 

TAN <- tree.bayes(training.data,"classFFB")

fitted <- bn.fit(TAN,training.data,method="bayes")

 

where training.data is a dataframe with 6 variables.

 

I have produced a plot of the network using graphviz.plot:

graphviz.plot(TAN)

 

The graph shows arcs between each of the variables and the output node
(classFFB) along with internal nodes showing parent/child relations between
4 nodes.

 

However, when I look at the model in the TAN object and the conditional
probabilities in the fitted object, there is only one direct arc leading to
output node (classFFB) through a variable EST, all other relations act
through that arc.

 

Am I correct in interpreting that the all direct nodes except for
EST->classFFB which are shown in the graphviz.plot are not retained once the
model is trained. In which case, is there a way of showing the network after
training?

 

Thanks in advance

 

Ross


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