R help - Nov 2009 - Error in text.rpart(fit) : fit is not a tree, just a root

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> I've tried to make a decision tree for the following data set:
....
> I don't get a tree...
 The rpart routine has decided that the best model it can find is the
"intercept only" model, i.e., a tree with no branches at all. 
Stepwise
regression can have the same outcome, by the way, if no variables pass
the F-to-enter threshold.  

The plot and text routines won't plot anything for a null tree, because
there is nothing interesting to plot.

Terry Therneau