[R] ipred bagging segfault on 64 bit linux build

2009-09-11 Thread jamesmcc
I wanted to report this issue here so others may not find themselves alone and as the author is apparently active on the list. I havent done an exhaustive test by any means, cause I dont have time. But here's a small example. Apparently the "ns" argument is the one that is killing it. I've gotten

Re: [R] rpart - the xval argument in rpart.control and in xpred.rpart

2009-09-11 Thread jamesmcc
I have this *exact* same confusion. Adding to this is the fact that Everitt and Hothorn in their book, HSAUR, say that setting xval=100 gives "100 runs of 10-fold cross-validation" (1st ed., page 136). Is this actually 1 run of 100-fold cross-validation? For large xval, doing multiple cross-v

Re: [R] goodness of "prediction" using a model (lm, glm, gam, brt, regression tree .... )

2009-09-11 Thread jamesmcc
I think it's important to say why you're unhappy with your current measures? Are they not capturing aspects of the data you understand? I typically use several residual measures in conjunction, each has it's benefits/drawbacks. I just throw them all in a table. -- View this message in contex

Re: [R] comparing random forests and classification trees

2009-09-17 Thread jamesmcc
Greetings tree and forest coders- I'm interested in comparing randomforests and regression tree/ bagging tree models. I'd like to propose a basis for doing this, get feedback, and document this here. I kept it in this thread since that makes sense. In this case I think it's appropriate to compar

Re: [R] Unable to install lme4

2009-10-01 Thread jamesmcc
I am baffled by this as well. I'm having the same issue. Using suse linux, with 64 bit R2.8.1. Thanks, james Zege, Andrew wrote: > > I am unable to install package lme4, after several attempts to do so using > various repository URLs. > Just to make sure everything works fine with proxy, co

Re: [R] Unable to install lme4

2009-10-01 Thread jamesmcc
rsion (2.8.1). I needed to install Matrix package first, which was also outdated. > R CMD INSTALL -l lib Matrix_0.999375-22.tar.gz > R CMD INSTALL -l lib lme4_0.999375-28.tar.gz it loads now within R. I haven used it much yet. jamesmcc wrote: > > I am baffled by this as well. I'm