Post drafted in 2010, and eventually published as is because I never found time to finish it
R error messages are usually clear but also are to deal with sometimes. For instance, in Error in text.rpart(fit) : fit is not a tree, just a root the problem is crystal clear (the tree has no branch) but the fix isn’t exactly obvious… I’ll list here errors of this kind as I encounter them.
Error in plot.rpart(fitvariable) (or in text.rpart) : fit is not a tree, just a root
The tree has no branch. Apart from bad input data, it can most likely be caused by the intercept only model begin the best: rpart has decided that the best model it can find is a tree with no branches at all, which of course can’t be drawn. So the fix is: you’ll need to provide a better model to try 😉
Source: http://r.789695.n4.nabble.com/Error-in-text-rpart-fit-fit-is-not-a-tree-just-a-root-td834231.html
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