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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