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RE: st: Interpreting Poisson regression results with squared term


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   stata list <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Interpreting Poisson regression results with squared term
Date   Wed, 13 Aug 2008 17:03:55 +0100 (BST)

Nick Cox wrote:
> In addition, the position of the turning point on the quadratic of Y
> in X1 given X2 and X3 can be derived easily. That may or may not have
> a substantive interpretation. 

Good point, using the example I sent earlier, you can find the turning
point and a confidence interval around it by typing: 

nlcom -_b[ment]/(2*_b[ment2])

-- Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
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