[R] Getting "Information matrix" in mixed models

[Chandra H.]

Hello,
I am Hukum Chandra and I'm a statistician. I am using R. I have gone
through R but I could not get the way how to find "Information matrix"
in R. In particular,  var-Cov matrix of components of variances in
linear mixed model. Could you please help me in getting the way to
produce it using R?

With best regards
Hukum
===================================
Hukum Chandra
Division of Social Statistics
School of Social Sciences
University of Southampton
SOUTHAMPTON SO17 1BJ, United Kingdom 
 Email : hchandra at soton.ac.uk, hcpatwa1 at rediffmail.com
 Web : http://www.socstats.soton.ac.uk/