True. But from the "Note" section of help(step) : This is a minimal implementation. Use 'stepAIC' in package 'MASS' for a wider range of object classes.
And from author(s) section : B. D. Ripley: 'step' is a slightly simplified version of 'stepAIC' in package 'MASS' (Venables & Ripley, 2002 and earlier editions). I am not sure why the simplification was necessary but I would prefer the slightly more comprehensive version. Besides I like the word AIC reflected in the function of the name as it is using AIC criterion to do stepwise selection. Regards, Adai On Mon, 2005-08-08 at 17:16 -0700, Kerry Bush wrote: > The last time I used it, the function step() was using > AIC as model selection criteria as the default. It is > in the base package so you don't have to refer to > other fancy functions. > > --- Adaikalavan Ramasamy <[EMAIL PROTECTED]> > wrote: > > > Are you looking for possibly stepAIC from the > > package MASS ? > > > > Regards, Adai > > > > > > > > On Mon, 2005-08-08 at 16:39 -0600, Martin Kardos > > wrote: > > > Hello All; > > > > > > I need to run a multiple regression analysis and > > use Akaike's Information > > > Criterion for model selection. I understand that > > this command will give the > > > AIC value for specified models: > > > > > > AIC(object, ..., k = 2) > > > > > > with "..." meaning any other optional models for > > which I would like AIC > > > values. But, how can I specify (in the place of > > "...") that I want R to > > > perform an model selection prodecure based on > > Akaike's Information Criterion > > > on a set of potential independent variables in a > > model such as: > > > > > > model.lm=lm(A~B+C+D+E+F+G) > > > > > > ? > > > > > > Thanks a million; > > > > > > Marty > > > > > > ______________________________________________ > > > R-help@stat.math.ethz.ch mailing list > > > https://stat.ethz.ch/mailman/listinfo/r-help > > > PLEASE do read the posting guide! > > http://www.R-project.org/posting-guide.html > > > > > > > ______________________________________________ > > R-help@stat.math.ethz.ch mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide! > > http://www.R-project.org/posting-guide.html > > > > > > > ____________________________________________________ > Start your day with Yahoo! - make it your home page > http://www.yahoo.com/r/hs > > ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html