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st: nonlinear N effect


From   Boris Peko <borispeko@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: nonlinear N effect
Date   Wed, 6 Mar 2013 12:14:51 +0100

Hi! I have a non-linear effect but not U-shape or reverse U-shape.
Effect is N-shaped, dependent variable rises, then fell, then rises.
How can I test that in Stata?
More important, what method should I use if I do not want to use
predetermined inflection point? Thanks a lot for any help!
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