Displaying 2 results from an estimated 2 matches for "obsxnum".
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obsnum
2003 Jul 15
1
Tree question
...reiman Olshen et al. Classification and Regression
Trees state "In a standard data structure [a tree] is invariant under
all monotone transformations of individual ordered varaibles" (p. 57)
However, I get very different results from
tr.hh.pri <- rpart((log(YPRISX+1)~AGE+DRUGUSEY+SEX+OBSXNUM))
and
tr.hh.pri <- rpart(YPRISX~AGE+DRUGUSEY+SEX+OBSXNUM)
the former gives more splits and different splits.
Some notes:
The DV is a count variable, and highly skew, with some 0s, many 1s, and
a long right tail out to 99.
AGE ranges from 18-25
DRUGUSEY is ordered (hardest drug used)
and
OB...
2003 Jul 17
1
Rpart question - labeling nodes with something not in x$frame
I have a tree created with
tr.hh.logcas <- rpart(log(YCASSX + 1)~AGE+DRUGUSEY+SEX+OBSXNUM +WINDLE,
xval = 10)
I would like to label the nodes with YCASSX rather than log(YCASSX +
1). But the help file for text in library rpart says that you can only
use labels that are part of x$frame, which YCASSX is not.
Is there a way to do what I want?
Thanks in advance
Peter
Peter L. Flom, Ph...