Wuming Gong wrote: > Hi Veronika, > > StepAIC does not do any test. But you may do a likelihood ratio test > on the difference between deviance of two models to judge which model > to use, simply like this, > > >>1 - pchisq(deviance.i - deviance.j, df.i - df.j) > > > And then check whether the returned p value is small enough...
... but then you are mixing different concepts. Uwe Ligges > Wuming > > On 6/18/05, Bókony Veronika <[EMAIL PROTECTED]> wrote: > >>Dear all, >>Could anyone please tell me how 'step' or 'stepAIC' works? Does it >>simply select the model with the smallest AIC from all the possible >>models? Or does it perform any test eg. whether the decrease >>in "information content" between a model with a given predictor and >>another without it is "significant"? >>Thanks for help! >>VB >> >>______________________________________________ >>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 ______________________________________________ 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
