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st: RE: Generate data and matrix from unbalanced panel

From   "Maarten Buis" <>
To   "Nguyen Cong Minh" <>
Subject   st: RE: Generate data and matrix from unbalanced panel
Date   Mon, 30 Jul 2007 16:22:18 +0200

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

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434 

+31 20 5986715

-----Original Message-----
From: Nguyen Cong Minh []
> Dear Prof. Maarten Buis,

I am not not a prof. If you insist on using titles my title is drs. (which 
is not the plural of dr., or a misspelling of ds., but doctorandus (he who 
may become doctor)

> The reason I asked because I want to write a estimation command in Stata
> (.ado and .mata file) for estimating the 2 way effects of SUR equations in
> an unbalanced panel. Since I cannot find any program for it, so I myself
> have to figure out some way to estimate the model. Do you know any current
> program on this topic?

No, but I haven't used panel data much, so it is very well possible that it 
exists without me knowing about it.

> Therefore, I have to store pd and Np into a vector so that I can use them in
> the loops.

If you want to loop in Stata you should not store those values in vectors, 
but in locals and use -foreach- to loop. 

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