Hi,
I wanted to check the difference in results (using lme4) , if I treated a particular variable (beadchip) as a random effect vs if I treated it as a fixed effect. For the first case, my formula is: lmer.result <- lmer(expression ~ cancerClass + (1|beadchip)) For the second case, I want to do: lmer.result2 <- lmer(expression ~ cancerClass + beadchip) However, I get an error in the second case: > Error in lmerFactorList(formula, fr, 0L, 0L): No random effects terms specified in formula Is there any way that I can get lmer() to accept a formula without a random effect? many thanks [[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.