Hey my name is daniel, i am writing my bachelor thesis and wondering if you can help me. i am trying to generate a regression tree via rpart. to reduce the error of the model i use cross validation, but instead of reducing the cross validation error (xerror) is increasing the more splits there are. I dont understand what that means. does it mean that my model doesnt fit the data- that there is no trend in the data? i am 100% sure that there must be a trend or correlation in the data.
> > please help me:) > > CP nsplit rel error xerror xstd > > 1 0.100022 0 1.00000 1.0192 0.14222 > > 2 0.066716 2 0.79996 1.3107 0.18720 > > 3 0.050471 3 0.73324 1.4127 0.21138 > > 4 0.033758 4 0.68277 1.5197 0.22826 > > 5 0.010376 5 0.64901 1.5360 0.23792 > > 6 0.000010 6 0.63864 1.5419 0.24280 ______________________________________________ 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.
