[R] pseudo-R2 or GOF for regression trees?

2007-05-05 Thread Prof. Jeffrey Cardille
Hello, Is there an accepted way to convey, for regression trees, something akin to R-squared? I'm developing regression trees for a continuous y variable and I'd like to say how well they are doing. In particular, I'm analyzing the results of a simulation model having highly non-linear

[R] pseudo-R2 or GOF for regression trees?

2007-05-05 Thread Prof. Jeffrey Cardille
All-- Apologies if I have inadvertently posted this message twice; I just joined the list today, after trying to post once. Thanks- Jeff # r-help message is below # Hello, Is there an accepted way to convey, for regression trees, something akin to R-squared? I'm developing regression

Re: [R] pseudo-R2 or GOF for regression trees?

2007-05-05 Thread Frank E Harrell Jr
Prof. Jeffrey Cardille wrote: Hello, Is there an accepted way to convey, for regression trees, something akin to R-squared? I'm developing regression trees for a continuous y variable and I'd like to say how well they are doing. In particular, I'm analyzing the results of a

Re: [R] pseudo-R2 or GOF for regression trees?

2007-05-05 Thread Prof Brian Ripley
On Sat, 5 May 2007, Prof. Jeffrey Cardille wrote: Hello, Is there an accepted way to convey, for regression trees, something akin to R-squared? Why not use R-squared itself for your purposes? Just get the fitted values from however you do the fit, and compute R-squared from the basic