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st: Fixing an -ml model- syntax problem

From   Clive Nicholas <>
Subject   st: Fixing an -ml model- syntax problem
Date   Tue, 20 Feb 2007 17:10:40 +0000 (GMT)

For fun, I thought I'd test out an old piece of Stata code I found in Allison (1999: 203-4) that fires up a logit model which takes into account unequal residual variation across groups. I'm sure it's just a minor thing, but I'm having problems running his Stata 6 routine, which utilizes -ml- code:

webuse union, clear
program define gplogit
   version 6
   args lnf theta delta
   qui replace `lnf' =
   ml model lf gplogit (union = age black grade south) ///
   (delta: black,nocons)  
ml maximize

Using Glenn Hoetker's -complogit- routine shows there is residual variation and actions the above model. Unfortunately, all I get with this code is

invalid syntax

which is rather puzzling, as I can't see a lot wrong. Can anyone solve this puzzle?

Clive Nicholas


Allison PD (1999) "Comparing Logit and Probit Coefficients Across Groups", SOCIOLOGICAL METHODS AND RESEARCH (28)2: 186-208.

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