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RE: st: nonconvergence of switching probit when data weighted


From   "Paula Albuquerque" <pcma@iseg.utl.pt>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: nonconvergence of switching probit when data weighted
Date   Thu, 12 Mar 2009 13:52:02 -0000

The weights are obtained through the European Social Survey database, I
suppose many researchers before me have used them. But, I have also wondered
that if in Stata, the weights are the inverse of the probability that the
observation is included, and probabilities should be between zero and 1, the
inverse should have a minimum of 1, shouldn't it? 

Paula


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Steven Samuels
Sent: quinta-feira, 12 de Março de 2009 13:14
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: nonconvergence of switching probit when data weighted


Most of your weights are < 1, which is a sign of trouble, though  
maybe not yours.  These observations do not even represent themselves.

-Steve
On Mar 12, 2009, at 8:00 AM, Paula Albuquerque wrote:



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