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Re: st: -nl- question [was: From: ... <kdrakos@upatras.gr>]


From   n j cox <n.j.cox@durham.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: -nl- question [was: From: ... <kdrakos@upatras.gr>]
Date   Fri, 23 Sep 2005 16:01:50 +0100

Please use informative subjects for your posts.
Also note that the Statalist software is lamentably
incapable of transliterating Greek characters.

You refer to an -nl- function -log4- bundled with Stata.
This fits equations of the form

y = b0 + b1 /(1 + exp(-b2*(x - b3)))

I see two variables there, y and x. I guess you want
to fit a more complicated equation with two predictor
variables on the RHS. You could do that with -nl-
but with -log4- only one functional form is on
offer. You would need to use a different syntax.

-nl- in Stata 9 is much more flexible than in
previous versions.

Nick
n.j.cox@durham.ac.uk

kdrakos@upatras.gr

Does anyone know if the command nl log4 can handle more than one variables
and if yes how the estimated parameters can be recovered?

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