Thanks everybody! (Nick C., Nick W., Scott)
It looks like I can play with various ways to get this done!
Mariano
From:[email protected] on 03/15/2005 09:20 PM EST
Sent by: [email protected]
Please respond to [email protected]
To: [email protected]
cc: (bcc: Mariano Sana/msana/LSU)
Subject: Re: st: RE: -prgen- with a quadratic function
Also, my -oprobpr- can do this; it is available from SSC.
--Nick Winter
At 10:03 PM 3/15/2005 +0000, you wrote:
>I don't think Scott Long is a member of Statalist.
>
>No matter: your problem should yield to -adjust-
>followed by an appropriate graph.
>
>Nick
>[email protected]
>
>Mariano Sana
>
> > Hi Statalisters. Someone experienced with ?prgen- might be
> > able to answer this.
> >
> > I ran a logit model that has, among its predictor variables,
> > AGE and AGESQ.
> > The coefficient for AGE is positive and the coefficient for AGESQ is
> > negative. The turning point is at age 79 or so. I?ve been trying to
> > generate a graph that shows how predicted probabilities vary
> > by age for a few groups in my analysis. I used the -prgen- command
from
> > the Spostado package.
> >
> > The graph that I get doesn't make sense. The probability
> > increases nonstop
> > and becomes asymptotic to 1 at age 90 or so.
> >
> > I realize that the problem is that -prgen- cannot vary the
> > value of AGESQ
> > as the value of AGE varies. The default for AGESQ is the
> > mean of AGESQ,
> > unless I specify another value. Obviously, I need AGESQ to
> > be the square of AGE as AGE varies.
> >
> > By now I think I have no other solution than running
> > -prvalue- (also from
> > the Spostado package) multiple times to get the probabilities
> > I need for
> > the graph. Or is there any other way? Is this a question for
> > Scott Long?
>
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--------------------------------------------------------
Nicholas Winter 607.255.8819 t
Assistant Professor 607.255.4530 f
Department of Government [email protected] e
308 White Hall falcon.arts.cornell.edu/nw53 w
Cornell University
Ithaca, NY 14853-4601
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