Thank you very much for the fast reply. What info about the dataset would be helpful to figure out what's going on about that error message? I am using a dataset wth N = 602, with information political institution in countries. Variables are almost all continuous and a few are binary. I am running two interation terms in the models. I'll be more than happy to provide any needed info.
2012/8/26 Kaveh Vakili <kaveh.vak...@wis.kuleuven.be> > > > whatever it is, it is specific to the dataset you are using, not the > software: > > library(robust) > p<-20 > n<-200 > x<-matrix(rnorm(n*p),n,p) > b<-rnorm(p+1) > y<-cbind(1,x)%*%b+rnorm(n) > lmRob(y~x) > > > you should therefore provide more informations about the dataset, > > > > > > > On 08/26/2012 07:33 AM, Fabricio Vasselai wrote: > >> Dear list, >> >> I've been trying different models with lmRob for the past days and I was >> wondering: is there a maximum number of variables to include in a model so >> to avoid the following error in lmRob? >> The error message is: >> >> Error in lmRob.fit.compute(x2, y, x1 = x1, x1.idx = x1.idx, nrep = nrep, >> : >> Singular matrix encountered.Erro em ans[[i]]$call : $ operator is >> >> invalid for atomic vectors >> >> >> It seems to me that there is a limit of 14 independent variables plus the >> intercept. It can run any combination of variables in any dataset I try, >> as >> far as final parameters are not beyond this limit. >> Is it right? I did not find information about this yet. Is there a way to >> go beyond this number of variables? >> >> Thanks in advance! >> Best, >> >> FABRICIO >> >> [[alternative HTML version deleted]] >> >> ______________________________**_________________ >> R-SIG-Robust@r-project.org mailing list >> https://stat.ethz.ch/mailman/**listinfo/r-sig-robust<https://stat.ethz.ch/mailman/listinfo/r-sig-robust> >> > > ______________________________**_________________ > R-SIG-Robust@r-project.org mailing list > https://stat.ethz.ch/mailman/**listinfo/r-sig-robust<https://stat.ethz.ch/mailman/listinfo/r-sig-robust> > [[alternative HTML version deleted]] _______________________________________________ R-SIG-Robust@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-sig-robust
