Hello lmer() - users,

A call to the lmer() function causes my installation of R (2.11.1 on Mac OS X 10.5.8) to crash and I am trying to figure out the problem.

I have a data set with longitudinal data of four subsequent performance measures of 1133 individuals nested in 88 groups. The data is in long format. I hypothesize a performance increase for each individual over time and intend to explain differences in these slopes with individual-level and group-level characteristics. Thus, I have hierarchic data with three levels (measurement time, individual, group).

With lme() (from the nlme package), this is my first simple model:

mod1 <- lme(fixed = performance ~ time,
                        random = ~ 1 + time | GroupID/StudentNumber,
                        data = dataset.long,
                        na.action = na.omit)

It fits to the data well. I tried to specify the same model in lmer():

detach("package:nlme")
library(lme4)

mod1 <- lmer(performance ~ time + (time | GroupID/StudentNumber), data = dataset.long, na.action = na.omit)

However, this call results in a segfault:

*** caught segfault ***
address 0x154c3000, cause 'memory not mapped'

and a lengthy traceback. I can reproduce this error. It also occurs when I don't load nlme before lme4. Can someone tell me what I am doing wrong? Any help is greatly appreciated.

With best regards,
Bertolt

--
Dr. Bertolt Meyer
Senior research and teaching associate
Social Psychology, Institute of Psychology, University of Zurich
Binzmuehlestrasse 14, Box 15
CH-8050 Zurich
Switzerland

bme...@sozpsy.uzh.ch

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