[R-sig-ME] Links to that "slow" lmer example I asked about
pauljohn32 at gmail.com
Tue Oct 6 21:57:48 CEST 2009
I asked a couple of weeks ago about the puzzle that my colleague's
linear mixed model can be estimated in HLM6 in 3 seconds, while lmer
requires about 50 seconds. I wondered if that was expected/known.
The discussion seemed to end with the conclusion "if you expect us to
evaluate that, give us the working example." Due to a death in my
family, I was delayed in responding, but here are the links to the
example data and code.
The data frame is saved with R's write function
I believe that is workable on all platforms. That's about 26,000 rows.
Variable V33 represents the groups (in this case, country). The
variables are generically named V1-V33.
The small simple test program to load the data and estimate the model:
The output I get, which has system.time wrapped around the use of lmer:
## user system elapsed
##55.448 0.216 55.756
Please remember I am not saying that lmer should work faster. I
understand it is capable of estimating models that other programs
cannot. I'm only trying to explain to a user why this one linear
model takes more time in lmer than in HLM6.
Paul E. Johnson
Professor, Political Science
1541 Lilac Lane, Room 504
University of Kansas
More information about the R-sig-mixed-models