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From |
Nick Winter <nw53@cornell.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: -prgen- with a quadratic function |

Date |
Tue, 15 Mar 2005 21:20:58 -0500 |

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 n.j.cox@durham.ac.uk 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? * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

-------------------------------------------------------- Nicholas Winter 607.255.8819 t Assistant Professor 607.255.4530 f Department of Government nw53@cornell.edu e 308 White Hall falcon.arts.cornell.edu/nw53 w Cornell University Ithaca, NY 14853-4601 * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: RE: -prgen- with a quadratic function***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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