stepAIC is support software for a book. Please do as the posting guide asks and consult the book, which explains both AIC and how hte function works.
The book is even a reference on the help page. On Mon, 8 May 2006, orkun wrote: > hello > > I built logistic regression model. > To model check I used stepAIC. But I don't know how it > is interpreted . I could not any find any explanation about it > For instance which model is preferable ? What are the critarias > to choose beter model > > I will appreciate if you give me an explanation ? > > models > --------- > > > lo1.step$anova > Stepwise Model Path > Analysis of Deviance Table > > Initial Model: > res ~ as.factor(jeo) + as.factor(eg) + as.factor(ys) + as.factor(yy) + > as.factor(ak) > > Final Model: > res ~ as.factor(jeo) + as.factor(eg) + as.factor(ys) + as.factor(yy) + > as.factor(ak) > > > Step Df Deviance Resid. Df Resid. Dev AIC > 1 788 30604.46 31588.77 > ~~~~~~~~~~ > > lo2.step$anova > Stepwise Model Path > Analysis of Deviance Table > > Initial Model: > res ~ as.factor(jeo):as.factor(eg) + as.factor(ys) + as.factor(yy) + > as.factor(ak) > > Final Model: > res ~ as.factor(ys) + as.factor(yy) + as.factor(ak) > > > Step Df Deviance Resid. Df Resid. Dev AIC > 1 728 3123352.66 3124456.98 > 2 - as.factor(jeo):as.factor(eg) 76 3052176 804 71176.54 72128.85 > > > kind regards > > -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
