For an answer to your question 2. look at help(try) and help(tryCatch). --- Yong Wang <[EMAIL PROTECTED]> wrote:
> Dear Rlist > > I am runing a for loop on a large dataset to do > exploring > investigation. Code embedded in the loop include the > "lm" routine. > Unfortunately, for some specification of dependent > variable, the loop > will be interrupted by error as below: > > Error in `contrasts<-`(`*tmp*`, value = > "contr.treatment") : > contrasts can be applied only to factors > with 2 or more levels > > I suspect this might be caused by missing value > which, once removed, > will left some factors has value only on one level. > It turnss out this > is not true. > > Answers for following two questions appreciated. > 1. what might be the possible reason behind the > error mesage > 2. if I simply want to circumvent this error and > keep the for loop > going, how should I do that. > > > Regards > young > > ______________________________________________ > 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. > ______________________________________________ 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.
