Dera all,
 a simple question on rpart: when I run rpart on some data sets, I do not always get the surrogate splits at the root node. This does not depend on the presence of missing data because none of  my data sets contains any, nevertheless sometimes i get them sometimes no, I wonder why!
Can anybody help me?
thanks a lot,
melina

Carmela Cappelli Department of Statistics
School of Political Science University of Naples Federico II
Via Rodinò n. 22 80138 Naples, Italy
tel: +39-081-2537553 fax:+39-081-2537466

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