lme and lmer syntax

Ronaldo

See the article on lmer pasted below for syntax. It is the only current source documenting the code. In lmer(), the nesting structure for the ranmdom effects is handled in a slightly different way. If your observations are nested as you note, then you can use

lmer(y~x1 + x2 +(1|x1) + (1|x2), data)

@Article{Rnews:Bates:2005,
  author       = {Douglas Bates},
  title	       = {Fitting Linear Mixed Models in {R}},
  journal      = {R News},
  year	       = 2005,
  volume       = 5,
  number       = 1,
  pages	       = {27--30},
  month	       = {May},
  url	       = {http://CRAN.R-project.org/doc/Rnews/},
}

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Ronaldo Reis-Jr.
Sent: Monday, October 24, 2005 3:56 PM
To: R-Help
Subject: [R] lme and lmer syntax

Hi,

I have this:

lme(y~x1+x2,random=~1|x1/x2)

How to make this random effect using lmer?

I try this:

lmer(y~x1+x2+(1|x1/x2)

But it dont work.

Any idea?

Thanks
Ronaldo
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