st: covariance structures

[David Airey <david.airey@Vanderbilt.Edu>]

Dear Statalist,

It would be nice to have an FAQ (if there isn't one) describing the 
various covariance structures (e.g, tables 41.3-41.5 of 
<http://www.otago.ac.nz/sas/stat/chap41/sect20.htm#mixedrepeat>) 
assumed by various Stata commands, explained comprehensively but at a 
fairly intermediate level, with Stata examples. A nice model is 
<http://www.gseis.ucla.edu/courses/ed231c/notes2/gee.html>.

-Dave

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