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Re: st: Plotting predicted probabilities from MNL over a quadratic predictor?


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Plotting predicted probabilities from MNL over a quadratic predictor?
Date   Thu, 25 Mar 2010 13:08:44 -0700 (PDT)

--- On Thu, 25/3/10, Devan Marshall wrote:
> Does anyone know of a package that will allow you to
> calculate and graph predicted probabilities from a
> multinomial logit over a quadratic or even a cubic
> predictor variable - such as age and age^2.

You can just use -predict- together with -twoway line-
like in the example below:

*------------ begin example ----------------
sysuse auto, clear
recode rep78 1/2 = 3

g mpg2 = mpg^2

mlogit rep78 mpg mpg2 trunk

sum trunk if e(sample), meanonly
replace trunk = r(mean)

predict pr*

twoway line pr? mpg , sort
*------------- end example ------------------

Hope this helps,
Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://www.maartenbuis.nl
--------------------------


      

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