See the acepack package or the transace function in Hmisc for ACE or AVAS. -- Bert
On Thu, Nov 3, 2011 at 8:55 AM, Johannes Radinger <jradin...@gmx.at> wrote: > Hello, > > I am doing a simple regression using lm(Y~X). > As my response and my predictor seemed to be skewed > and I can't meet the model assumptions. Therefore > I need to transform my variables. > > I wanted to ask what is the preferred way to find out > if predictor and/or response needs to be transformed > and if yes how (log-transform?). > > I found a procedure in "A modern approach to Regressoin > in R" (Sheather, 2009): There they suggest an approach > with the function bctrans from alr3...but it seems that it > is deprecated. So what is the best way (box-cox test) find the best > transformation for predictor and response simultaneously? > AFAIK boxcox from MASS is used only used for transformation > of the predictor? > > Thank you very much > Johannes > > -- > > ______________________________________________ > 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. > -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm [[alternative HTML version deleted]] ______________________________________________ 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.
