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st: AW: RE: nlcom from several estimations

From   "Martin Weiss" <>
To   <>
Subject   st: AW: RE: nlcom from several estimations
Date   Mon, 8 Feb 2010 16:36:12 +0100


Have you actually tried to -ereturn post- foreign results and apply -suest-
to them? That sounds like a stretch to me. You should first check whether
you can recreate the results in Stata, perhaps using -reg3/nlsur-?


-----Ursprüngliche Nachricht-----
[] Im Auftrag von Valerie Orozco
Gesendet: Montag, 8. Februar 2010 16:29
Betreff: st: RE: nlcom from several estimations

Thank you John and Martin.

John :  by "model", I don't mean different groups, but really different
models. I'm estimating 4 different systems of equations (N3SLS= Nonlinear 3
stages system of equations) and the variables are not the same in each one.
(my goal is then to estimate unconditional elasticities in a demand system
coming from the elasticities from different steps...).

"Suest" seems to do what I need except that I have a difficulty due to the
fact that the estimation wasn't done with Stata (because Stata doesn't
easily estimate N3SLS). But like I prefer Stata, I stored the b and V matrix
into text files and then insheet in Stata and re"build" my matrix b`i' and
V`i' (i=1,...,4)...I can also use "ereturn post" to "re"build each
estimation and store it.

But, doing "suest", it seems some informations (for example e(sample),
e(N)...stored by local during the estimation) are missing...

If you have more ideas...

Thank you


>From 	  "Martin Weiss" <>
To 	  <>
Subject 	  st: AW: nlcom from several estimations
Date 	  Mon, 8 Feb 2010 14:35:14 +0100

Have you had a look at -suest- yet?



On 08.02.2010 14:32, Valerie Orozco wrote:


I have to estimate some nonlinear combinations of parameters estimated from
several models.
More precisely, I estimated 4 models (4 systems of equations) and have the
corresponding matrix of estimated parameters (b1, b2, b3 and b4) and each
corresponding variance covariance matrix (V1, V2, V3, V4). I want to
estimate combinations of these parameters coming from these 4 estimations.
The problem is that, with "nlcom", it has to be from only one estimation.

So, my first idea was to build two new matrix (b and V) making Stata
believes it comes from only one estimation : 

	- b : just appending b1,b2, b3 and b4 horizontally
    	- V : a block diagonal matrix (each block being V1, V2, V3 and V4)
    	- but of course, some elements of this V block diagonal matrix are

Another idea I had was to use "eststo" and "estout" commands but it seems
the matrix stored correspond to the last estimation.

Do you have some better ideas to help me?

Many thanks.


Valérie OROZCO
Toulouse School of Economics (INRA-GREMAQ)
21, allée de Brienne
F-31000 Toulouse, France

MA 101
+33 5 61 12 85 91

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