The partial dependence at X1=x is simply the average of predicted response at all data points, holding X1=x. No additional `normalization' is done.
That web link says the image does not exist. Andy From: Christopher Schwalm > 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 have noticed that partial dependence plots cluster > around the mean > response. That is, if I'm looking at the partial dependence > plot of y given > x1, x2, x3 and I standardize the x's (so they scale sensibly to be > displayed on one graph) then everything seems to meet at mean(y) and > z-score of 0 for all x's. The match is not exact but is close > and shows up > in all partial dependence plots I've looked at for this > particular project. > A sample graph of this is here: > > img213 imagevenue com/img php?image=48746_partial_plot_122_538lo jpg > > [replace spaces with dots, this bounces otherwise] > > I am unsure if this means anything or if it's built in (like > a SLR going > thru the mean of x an y). I should note that for this example I have > assumed that the y-axis is not scaled somehow (see first question). > > Any insight appreciated. Thanks for your time. > > Christopher > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > Notice: This e-mail message, together with any attachme...{{dropped:12}} ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
