Has anyone used the rlm regression function. I am using a factor variable as part of this regression. If the number of occurrences of any factor is 0 or 1 it complains with the error that
'x' is singular: singular fits are not implemented in 'rlm' The droplevels function removes 0 occurrence factors, is there a way to eliminate ones that have occurrence of 1. [[alternative HTML version deleted]] ______________________________________________ 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.