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Re: st: order probit: SAS vs STATA

From   Maarten buis <>
Subject   Re: st: order probit: SAS vs STATA
Date   Thu, 25 May 2006 18:03:59 +0100 (BST)

--- Carol Bao <> wrote:
> I am wondering if anyone has attempted ordered probit
> estimation using SAS as well as STATA?  We find that
> the resuls (both the estimates on the threshold values
> and the explanatory variables) are quite different
> using the two software.  Is this "normal" and what the
> explanations might be?

I have no experience with SAS but this is normal since 
a ordered probit needs to constrain either the threshold 
values or the constant to be identified and different 
software chooses different identifying constraints. 
Different identifying constraints lead to parameters that
look very different, but if properly interpreted, lead to
exactly the same conclussions.

Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z214

+31 20 5986715

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