[R] HLM Model

Belle ping.yi at gmail.com
Thu Jan 27 21:53:49 CET 2011

Hi Harold:

Yes, this was the R code that I tried, and got different result from SAS. 

Is that mean I cannot actually use R to run unstructured covariance matrix?
How can I solve this problem if I need an unstructured covariance matrix

Thanks for the help.
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