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Re: st: Plotting predicted probabilities from MNL over a quadratic predictor?
From
Maarten buis <[email protected]>
To
[email protected]
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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