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...t model. However, in the rpart package I am not getting trees of all sizes but for example three sizes are 1,2,5 in one example I am working with, while with cv.tree in package tree it gives 1,2,3,4,5 like I would guess it should (weakest link pruning successively collapses the internal nodes that contrubute the least). What is the reason for this? A second problem I am having in both packages is that the cross-validation results are highly variable between different runs of the programs. This is not unexpected as cross-validations means that the dataset is randomly divided in 10 equal subsets, which...