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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