Dear Joseph,
Thanks very much for input. This topic also interests me (see archives) (http://www.stata.com/statalist/archive/2002-06/msg00075.html
I am not a statistician and I do not understand what the theta (.177746) is or what it might be used for. Could you explain? I tried to find the 'sa' option, but could not. On omitting it, the output appeared to be identical to that with the 'sa' option.
Thanks very much.
Gerben ter Riet, MD PhD, Academic Medical Center
Dept. General Practice, Room J3-354, 1105 AZ Amsterdam
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