[R] regression tree robustness

[Clayton Springer]

Bill Venables suggestes:

> The problem, such as it is, is not with rpart but with your model.  You
> might try a transformation of y, for example, and see if you get anything
> more useful to you.  With a transformed response the least squares fitting
> procedure might be more reasonable and productive.

Is there robust alternative to least squares fitting that could applied instead?

--Clayton
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