st: Different numbers of observations in sureg

[Marcello Pagano <pagano@hsph.harvard.edu>]

Alemu Mekonnen wrote:
>  
>  I would like to use different number of observations in the different 
> equations when using the seemingly unrelated regression command in 
> stata (i.e., sureg). For example, if there are two equations, I wanted 
> to use 600 observations for equation 1 and 900 observations for 
> equation 2. My question is how do I limit the number of observations 
> to do this. I was not able to use the IF command but this applies to 
> all the equations in the system.
> Kind regards,
> Alemu Mekonnen
>
>
> Alemu Mekonnen, Ph.D.
> Department of Economics
> Addis Ababa University
> P.O. Box 150167
> Addis Ababa
> Ethiopia
> Phone: +251(0)911 157055(Mobile)
>
> ------------------------------------------------------------------------
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