AW: st: betacoef for new variable?

[Fabian Nagel <Fabian.Nagel@uni-konstanz.de>]

1.) Pryvet Vladimir,
	spasiba for your quick response.

2.)
So far I adopted Vladimir´s advice.

forvalues i=1/30 {
xi: reg conver lag_log_ssegdp i.year if country==`i', noconstant
betacoef
return list
matrix list r(beta)
}

This results in:
matrices:
               r(beta) :  1 x 27
 (for each of the 30 countries)

But somehow I don`t get the trick, when I try to use -svmat- for  
saving the values as variables. Or ist any other operation more  
suiteable to transform those beta-coefficients into new a new list of  
variables?


If anyone has any idea I will appreciate it,
 Fabian


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu  
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Vladimir  
Vakhitov
Gesendet: Freitag, 21. März 2008 00:17
An: statalist@hsphsun2.harvard.edu
Betreff: Re: st: betacoef for new variable?

Fabian,

1. Beta-coefficients are calculated based on your regression. If you
want to include betas for every year, include annual dummies into your
regression.
For example:
xi:  conver lag_log_ssegdp i.year if country==`i', noconstant

2. -r(beta)- is a matrix, and you are trying to save the matrix into
the variable, that is why you are getting an error r(109). Look for
-matrix subscription- in Help to see how to address individual
elements of the matrix.

Best wishes,
Vladimir.


2008/3/20, Fabian Nagel <Fabian.Nagel@uni-konstanz.de>:

> Dear Stata-community,
>
>  I want to generate a new variable containing the current value of the
>  beta-coefficient for each country, each year. The dataset includes 30
>  countries for the period from 1980-2003.
>
>  My last thought was:
>
>  forvalues i=1/30 {
>  reg conver lag_log_ssegdp if country==`i', noconstant
>  betacoef
>  generate beta=r(beta) if country==`i'
>  }
>
>  The problems I have now are:
>
>  1.
>  I want the beta-coefficient to be calculated for each year AND each
>  country and not only for each country, but right now I have no idea
>  how I can achieve this.
>
>  2.
>  When the loop generates beta=r(beta) I receive the r(109), type
>  mismatch. Is there any possibility to save the beta-coefficients (for
>  each year and each country) as a new variable?
>
>  Thanks for any suggestion in advance,
>   Fabian
>
>
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--
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