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nicugeorgian wrote:Concerning Error: Could this show up because there are (nominal) values of the attribute 'z' in the test set that are not among the values of the same attribute 'z' in the training set? Why would this be so? There would anyway be a branch of the regression tree those values can be mapped to, right? After all, every tree node's underlying boolean condition can be evaluated regardless of whether some test values cannot be found among the training values.