Hi, I am trying to test whether a factor (coded as a set of dummy variables) is equal to zero, using linearHypothesis. I get an error. See a reproducible example:
data(swiss) my_swiss = swiss my_swiss$fake = factor(sample(c("A","B"),47,rep=T)) my_lm <- lm(Infant.Mortality ~ Fertility + fake, data=my_swiss) > linearHypothesis(my_lm, "fake") Error in constants(lhs, cnames_symb) : The hypothesis "fake" is not well formed: contains bad coefficient/variable names. In addition: Warning message: In constants(lhs, cnames_symb) : NAs introduced by coercion > ______________________________________________ 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.