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I would like to create a list of factor levels represented by elements
of letters shown in an rpart plot. It seems that the order of levels
for a factor are different than the alphabetized order returned a simple
list command, e.g., rpartModel$factor_name.
I was also wondering how best to model factors with many levels, or does
the classification algorithm already subset these? I was thinking of
thresholding observations on some minimum count for each level.
