Hi,
My questions concern the function 'mclustBIC' which compute BIC for a range of
clusters of several models on the given data and the other function
'mclustModel' which choose the best model and the best number of cluster
accordind to the results of the previous cited function.
1) When trying the following example (see ?mclustModel), I get negative BIC
computed by 'mclustBIC', and the best model according to the results of
'mclustModel' is the one with the highest BIC (i.e. the closer to zero).
irisBIC <- mclustBIC(iris[,-5])
plot(irisBIC)
mclustModel(iris[,-5], irisBIC)
Because I don't find anything about this point, could someone confirm that when
the BIC are positive, we try to the minimize the criterion (the model with the
smallest BIC is the best one) but when the BIC are negative we look for the
higher BIC (the model with a the BIC closest to zero is the best one) ?
2) Does the $G argument from the output of 'mclustModel' represent the best
number of clusters for the chosen model ?
Many thanks, this is my first post on R help, but I often consult the forum for
4 years.
Cladoo
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