[R-sig-ME] Lmer and variance-covariance matrix

Paul Johnson pauljohn32 at gmail.com
Sun Mar 13 03:56:45 CET 2011

Dear Antoine:

This is interesting, but...

On Thu, Mar 3, 2011 at 7:03 AM, Antoine Paccard
<antoine.paccard at unine.ch> wrote:
> Dear modelers,
> I have been trying in the past few months to obtain a variance-
> covariance matrix using lmer. I failed multiple times until I decided
> to do it under SAS.

Since many people here think your model cannot be fit, but you say it
can be fit with SAS, can we please see your SAS command and the
output?  SAS may be throwing out some parameters from the model
automatically, but lmer does not.

Just guessing :)


Paul E. Johnson
Professor, Political Science
1541 Lilac Lane, Room 504
University of Kansas

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