Re: st: nonconvergence of switching probit when data weighted

[Steven Samuels <ssamuels@albany.edu>]

There is no problem, Paula. I should have looked at your output more  
closely. The weights were standardized so that they sum to the sample  
size, not the population size. This practice was common before survey  
software became widely available.

-Steve

On Mar 12, 2009, at 9:52 AM, Paula Albuquerque wrote:

> 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

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