On May 11, 2010, at 6:49 PM, Changbin Du wrote:
HI, Dear R community,
How to extract the variables actually used in tree construction? I
want to
extract these variables and combine other variable as my features in
next
step model building.
help(package=rpart, rpart.object)
printcp(fit.dimer)
Perhaps:
fit.dimer$terms
Classification tree:
rpart(formula = outcome ~ ., data = p_df, method = "class")
Variables actually used in tree construction:
[1] CT DP DY FC NE NW QT SK TA WC WD WG WW YG
Root node error: 608/1743 = 0.34882
n= 1743
CP nsplit rel error xerror xstd
1 0.185033 0 1.00000 1.00000 0.032726
2 0.052632 2 0.62993 0.65132 0.028773
3 0.026316 4 0.52467 0.58059 0.027596
4 0.025768 5 0.49836 0.57072 0.027419
5 0.019737 8 0.42105 0.56086 0.027239
6 0.018092 9 0.40132 0.55263 0.027087
7 0.013158 12 0.34704 0.52796 0.026616
8 0.011513 13 0.33388 0.50000 0.026056
9 0.010000 15 0.31086 0.48520 0.025748
THanks so much!
--
Sincerely,
Changbin
--
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