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Hi, I wonder if anyone has written any code to implement the suggestions of Smart et al (2004) in the Bulletin of the Ecological Society of America for a new way of graphically presenting the results of logistic regression (see www.esapubs.org/bulletin/backissues/085-3/bulletinjuly2004_2column.htm#t ools1 for the full text)? I couldn't find anything relating to this sort of graphical representation of logistic models in the archives, but maybe someone has solved it already? In short, Smart et al suggest that a logistic regressio...

Dear R-helpers, a S-code for piecewise regressions was provided by Toms & Lesperance (2003) Ecology, 84, 2034-2041 (paper can be found on the web).The code is quite complete with different types of transitions around breakpoints and model selection fonctions. It doesn't work directly under R due to some "translation" problems I guess. However I reckon that it would be a

Hello, I was wondering if anyone knew of an R function/R code to plot bivariate (3 dimensional) partial dependence plots in random forests (randomForest package). It is apparently possible using the rgl package (http://esapubs.org/archive/ecol/E088/173/appendix-C.htm) or there may be a more direct function such as the pairplot() in MART (multiple additive regression trees)? Many thanks, Lucie My Computer: HP Z400 Workstation, 16.0 GB, Windows 7 Professional, Intel(R) Xeon(R) CPU, W365 3.20 GHz 3.19 GHz 64...

Hello, I'm using R code that includes a residual permutation that was written as a supplement to the paper: Turner et al. 2010. A general hypothesis-testing framework for stable isotopes ratios in ecological studies. Ecology 91:2227-2233. The supplemental code is available at: http://www.esapubs.org/archive/ecol/E091/157/suppl-1.htm When I execute the function, no warnings are given (seems fine). But the resulting output matrix is simply a matrix of repeating rows (i.e., it appears as if the function is selecting the same "random" sample every time). The function is as follows...

Dear R users! Does someone know about any algorithms / packages in R, that perform classification / regression / decision trees using multivariate splits? I have done some research, but I found nothing. Packages "tree" and "rpart" seem only to be able to do CART with univariate splits. Thank you for your help! B?lint -- Cz?cz B?lint PhD hallgat? BCE KTK Talajtan ?s

...ded S-Plus functions in the archives. I haven't looked at the files, so I'm not sure what modifications would be necessary for R. De'ath, G. 2002. Multivariate regression trees: a new technique for modeling species--environment relationships. Ecology 83:1105-1117. Archives: http://www.esapubs.org/archive/ecol/E083/017/ Scott > Date: Mon, 19 Jun 2006 16:17:40 +0200 > From: " B?lint Cz?cz " <elatine at gmail.com> > Subject: [R] multivariate splits > To: r-help <r-help at stat.math.ethz.ch> > Message-ID: <fab4bcf70606190717r45a2030dg at mail.gmai...