[R] lmer for 3-way random anova
Douglas Bates
dmbates at gmail.com
Sat Dec 10 15:41:42 CET 2005
If you are running on a Linux system you can try an experimental
version of the Matrix package that is available from the SVN archive.
The URL is
https://svn.r-project.org/R-packages/branches/Matrix-mer2
The code in that branch uses what is called a supernodal sparse
Cholesky factorization which works very well for these types of
models. Once I get the Laplace and AGQ methods for generalized linear
mixed models working in this formulation I will merge the branch back
in to the trunk and release a version of the Matrix package using
this.
I haven't created a Windows binary for this experimental branch
because I still can't get the compilation system to work on my Windows
computer. If someone wants to try compiling on Windows from the SVN
sources I would appreciate it.
On 12/9/05, Dick Beyer <dbeyer at u.washington.edu> wrote:
> I have been using lme from nlme to do a 3-way anova with all the effects treated as random. I was wondering if someone could direct me to an example of how to do this using lmer from lme4.
>
> I have 3 main effects, tim, trt, ctr, and all the interaction effects tim*trt*ctr. The response variable is ge.
>
> Here is my lme code:
>
>
> dat <- data.frame(ge=ge,trt=factor(trt),tim=factor(tim),ctr=factor(ctr))
> dat$grp = as.factor(rep(1, nrow(dat)))
>
> # dim(dat) = 216x5
>
> w <- lme(ge ~ 1,data=dat,
> random = list(
> grp = pdBlocked(list( pdIdent(~ trt - 1)
> ,pdIdent(~ tim - 1)
> ,pdIdent(~ ctr - 1)
> ,pdIdent(~ trt:tim - 1)
> ,pdIdent(~ trt:ctr - 1)
> ,pdIdent(~ tim:ctr - 1)
> ,pdIdent(~ trt:tim:ctr - 1)
> )
> )
> )
> )
>
> I was trying the following as a starting place:
>
> lmer(ge~1+(1|tim)+(1|trt)+(1|ctr), data=dat)
>
> but this causes my R session to terminate.
>
> > sessionInfo()
> R version 2.2.0, 2005-11-15, i386-pc-mingw32
>
> attached base packages:
> [1] "methods" "stats" "graphics" "grDevices" "utils" "datasets" "base"
>
> other attached packages:
> lme4 lattice Matrix
> "0.98-1" "0.12-11" "0.99-2"
>
> Thanks very much for any help or pointers,
> Dick
> *******************************************************************************
> Richard P. Beyer, Ph.D. University of Washington
> Tel.:(206) 616 7378 Env. & Occ. Health Sci. , Box 354695
> Fax: (206) 685 4696 4225 Roosevelt Way NE, # 100
> Seattle, WA 98105-6099
> http://depts.washington.edu/ceeh/ServiceCores/FC5/FC5.html
> http://staff.washington.edu/~dbeyer
>
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