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RE: st: St: Ordered Logit Question

From   Richard Williams <>
To   "" <>, "" <>
Subject   RE: st: St: Ordered Logit Question
Date   Fri, 08 May 2009 17:19:10 -0500

At 04:00 PM 5/8/2009, Jason Dean, Mr wrote:
Hmm, I'll have to take a look at it again. But when I run separate ologits and do predicted values they are much different then when I combine the sample and include a immigrant dummy (and of course interact all covariates). Maybe I made a typo in my code.

You are only allowing for index shift (all cutpoints differ by the same amount) by doing so, so your pooled model is more constrained than when you run separate ologits. If you want a pooled model to perfectly reproduce your separate ologit results, try something like

use "";, clear
ologit warm  yr89 if male, nolog
ologit warm  yr89 if !male, nolog
gen maleyr89 = male * yr89
gologit2  warm yr89 male maleyr89, npl(male) lrf

The code I gave earlier would be handy if you thought the only difference between groups was in their cut points.

Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME:   (574)289-5227
EMAIL:  Richard.A.Williams.5@ND.Edu

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