Dan Dillon <dgdillon <at> gmail.com> writes: > > Colleagues: >
[snip] > > My data are from a behavioral experiment in which two groups of subjects > complete 200+ trials of a task with two conditions. Each subject is tested > in one of four separate locations. I record accuracy (0 or 1) and response > time (RT) on each trial--these are the DVs for the two regressions. Thus, > my dataframe has columns "location", "group", "subject", "trial", > "condition", "accuracy", and "RT". > > The regression model for accuracy looks like this: > > acc.fm = glmer(accuracy ~ location + group*condition + (1|subject), > family=binomial, data=my_data) > > The results look as expected and I'm using lsmeans to do some follow-up > analyses. For example, to compare accuracy by group and condition, I'm > doing this: > > acc.lsm <- lsmeans(acc.fm, ~group|condition) > > pairs(acc.lsm) > > [snip] > Here is my model for the RT data > (RT is a continuous variable so no logistic regression here): > > rt.fm = lmer(rt ~ location + group*condition*accuracy + (1|subject), > data=my_data) > > The results from this regression look fine, but if I try this . . . > > rt.lsm <- lsmeans(rt.fm ~ group|condition) > > . . . or if I try to specify a reference grid like this . . . > > rt.rg <- ref.grid(rt.fm) > > . . . my machine hangs. > [snip] It's a little hard to say without a reproducible example, and this question would probably be slightly more appropriate for r-sig-mixed-mod...@r-project.org (although I can't actually tell for sure whether it is an lme4-specific problem or a more general ls.means::ref.grid question), but: how big a reference is ref.grid() trying to construct? Is it fairly high-resolution/high-dimensional? I would probably try some experiments with small subsets of your data to see how the results scale. ______________________________________________ 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.
