[R] randomForest partial dependence plots

Hello ALL, I'm unsure how to interpret partial dependence plots and had 2 questions: Does the randomForest library scale partial dependence plots such that zero on the y axis is mean(y)? I am also unclear as to why the range of y on these plots is smaller than what is in the dataset. Also I

[R] Using tune with gbm --grid search for best hyperparameters

Hello LIST, I'd like to use tune from e1071 to do a grid search for hyperparameter values in gbm. However, I can not get this to work. I note that there is no wrapper for gbm but that it is possible to use non-wrapped functions (like lm) without problem. Here's a snippet of code to illustrate.

[R] Cryptic error message using RuleFit

Hello LIST, In using Rulefit I;ve bee nabel to fit a model using rulefit without incident. However, when trying to use intnull and interact things go astray. > rf=rulefit(x,"N", cat.vars="H", > not.used=c("G","T"),huber=0.9,path.speed=1); [snip] RuleFit model 2/26/2008 2:17p ave(abs(error))

[R] Package for Multiple Additive Regression Trees

Hello List, I've been unsuccessful in tracking down a package that does MART. J Friedman's website has a page that mentions an R implementation but the links lead nowhere. There is also a nice walkthru/vignette pdf on his site. But I can not find this package anywhere. Perhaps it's commercial?