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...is version will support these packages (when I install them from the GUI, the function lmer does not work). I wondered if I need to install a newer version of R, and if so, which version should I install, and how should I do that? Thank you so much for your time and help. Please send replies to tsfeldman at noble.org Take care, Tracy S. Feldman Postdoc Noble Foundation

...t models with and without random effects to see if the pattern of fixed effects is different? I can look at random effects using "ranef(model_name)", but this function does not assess their significance. I am not subscribed to this list, so if possible, please reply to me directly at tsfeldman@noble.org . Thank you for your time and help. Sincerely, Tracy Feldman [[alternative HTML version deleted]]

...with how to report these effects succinctly, especially because for categorical variables, each category has its own estimated effect. What is a reasonable way to do this? Or should I just avoid it entirely? I really appreciate your time and help. Please reply to tracysfeldman@yahoo.com or tsfeldman@noble.org Sincerely, Tracy S. Feldman --------------------------------- [[alternative HTML version deleted]]

...hat are not exactly the same (although I do get the same general patterns of significance). Is there any reason why an updated version of lmer in R would give different answers than the same function in a previous version? See example below. I appreciate your help. Please direct answers to tsfeldman@noble.org Sincerely, Tracy S. Feldman Postdoc, The Samuel Roberts Noble Foundation Example: The model formulas (same in both): fitvisit1.1<-lmer(visitsR~dist + ctrt + (1|rep) + (1|field), family = poisson, method = "ML") fitvisit1.3<-lmer(visitsR~dist + (...