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You may have run into the problem on slide 26 of
http://www.stata.com/meeting/fnasug08/gutierrez.pdf
Also look at http://www.stata.com/meeting/2sweden/gutierrez_sweden07.pdf
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Simon Moore
Gesendet: Freitag, 14. August 2009 16:38
An: [email protected]
Betreff: st: xtmepoisson
Dear Statalist
I have data from over 60k school kids over ten years by school and I'm
interested in looking at the relationship between personal and aggregate
variables (alcprice, price of alcohol by year) on alcohol use (a count
variable, number of drinks). Data is collected from the same schools
over time.
I'm on a bit of a learning curve here and my initial thought was to use:
xtmepoisson alcohol age smoker alcprice ... || school: || year:
alcprice, cov(unstr)
where alcprice is the annual affordability of alcohol. Having started
the model three hours ago, it has now been sitting there at the
"Refining starting values:" without the slightest indication that it is
making headway.
There is no such problem when I try:
xtpoisson alcohol age smoker alcprice year alcprice ... , i(school)
So my question is - have a done something strange in the xtmepoisson
command that Stata may object to, if not, is there a rule of thumb for
the length of time I should wait for?
Regards
Simon
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