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From   "L.E.Gross" <L.E.Gross@maths.hull.ac.uk>
To   statalist@hsphsun2.harvard.edu
Date   Tue, 10 Dec 2002 11:31:12 +0000

Dear list

I have a question regarding the xtgee command. I have 4 time points and
want to assume there is correlation between time points 1&2.1&3,2&4 and
3&4 but not between 1&4 and 2&3.

I therefore need to specify my correlation matrix as a 'fixed' one but 
am unsure how to create this so that it shows the above correlations.

I can't seem to find an example of how to do this.

Many thanks
Laura

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