[R] predict.rpart question
Dear All, I have a question regarding predict.rpart. I use rpart to build classification and regression trees and I deal with data with relatively large number of input variables (predictors). For example, I build an rpart model like this rpartModel <- rpart(Y ~ X, method="class", minsplit =1, minbucket=nMinBucket,cp=nCp); and get predictors used in building the model like this colnamesUsed<-unique(rownames(rpartModel$splits)); When later I apply the rpart model to predict the new data I strip the input data from unneccessary columns and only use X columns that exist in colnamesUsed. Unfortunately I get error message like this Error: variable 'X' was fitted with type "nmatrix.3522" but type "nmatrix.19" was supplied The error message is correct. In the documentation it clearly specifies that the predictors referred to in the right side of formula (object) must be present by name in newdata, but I wonder why, if they are not used? Thanks DK _ Share what Santa brought you __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] predict.rpart question
Dear All, I have a question regarding predict.rpart. I use rpart to build classification and regression trees and I deal with data with relatively large number of input variables (predictors). For example, I build an rpart model like this rpartModel <- rpart(Y ~ X, method="class", minsplit =1, minbucket=nMinBucket,cp=nCp); and get predictors used in building the model like this colnamesUsed<-unique(rownames(rpartModel$splits)); When later I apply the rpart model to predict the new data I strip the input data from unneccessary columns and only use X columns that exist in colnamesUsed. Unfortunately I get error message like this Error: variable 'X' was fitted with type "nmatrix.3522" but type "nmatrix.19" was supplied The error message is correct. In the documentation it clearly specifies that the predictors referred to in the right side of formula (object) must be present by name in newdata, but I wonder why, if they are not used? Thanks DK _ Who's friends with who and co-starred in what? [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
