[S] rpart

Carlos Alzola (calzola@mailhost.apa.com)
Wed, 24 Jun 1998 16:51:47 -0400


I am trying to use rpart for a classification problem with 10,000 observations.
The dependent variable has 11 levels and I have 4 predictors: 2 continuous and 2
categorical (with 5 and 4 levels respectively). It runs fine if I take the
defaults, but if I use a loss matrix (with off-diagonal elements equal to the
absolute value of the misclassification error it just runs forever and never
finishes).

Am I being too ambitious here and the problem is just too big? (10,000 is 25% of
the full dataset).

Thanks for any input you can provide.

(I'm using S-Plus 3.4 on Sun Solaris (2.0?) with 512M of RAM)

Carlos Alzola
calzola@apa.com
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