Dear, R-sig-mixed model list users:

I am wondering if you know how to  estimate a variance-covariance matrix
based up a three level dataset. Suppose I have the following variables
(X1-X9) in three level (students/Classes/Schools). Which R package  can
estimate a var-cov matrix?
I really appreciated your inputs!  Thanks!


   1. gender [binary]
   2. age [continuous]
   3. language spoken[binary]
   4. educational aspiration[categorical]
   5. family support [categorical]
   6. importance of being successful [binary]
   7. SES [continuous]
   8. time homework[continuous]
   9. tutorial assistance [binary]



-- 
Qiu Wang
Measurement and Quantitative Methods
College of Education
Michigan State University

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