[R] predicted possibilities for classification tree??

[jones christian]

Hello!
I would like to  use a classification tree as a species modelling method. The dependent variable is binary (0,1),the independent variables are numeric. So I have to surround the dependent variable with factor(). That tells tree() that I want a logistic, or classification, tree rather than a regression tree. Here the code: tree(formula = factor(y) ~ x1 + x2 + x3)
For interpretation reasons I prefer to have the predicted probabilities  between 0 and 1 at every leaf point but as a result I only get  discret values of 0 or 1. Leaving out "factor" plots the desired predicted probabilities but then the selected variables differ (decision rules of classification vs regression tree)and above all I guess this would violate the convention?!
So does anyone know how to go about this?
many thanks in advance
Christian 

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