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RE: st: Extracting specific elements from a matrix


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Extracting specific elements from a matrix
Date   Mon, 5 Jul 2010 23:50:51 +0200

<>


If "all at once" is desired, Roger`s -ssc d parmest- is more convenient:


***********
sysuse auto, clear
ds price make, not
regress price `r(varlist)' , nocons

capture which parmest
if _rc ssc install parmest

parmest, saving(betas, replace)
u betas, clear
l parm estimate
***********


HTH
Martin


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Eric Booth
Sent: Montag, 5. Juli 2010 23:42
To: <statalist@hsphsun2.harvard.edu>
Subject: Re: st: Extracting specific elements from a matrix

<>


Or you can use -svmat- to get them all at once.  e.g., 

******************************!
clear
webuse auto
ds price make, not
regress price `r(varlist)' , nocons
mat A = get(_b)
matrix li A
*****
preserve
clear
svmat A, names(beta_)
g id = _n
reshape long beta_, i(id) j(beta_num)
drop id
save betas.dta, replace
restore
*****
use betas.dta, clear
******************************!

~ Eric
__
Eric A. Booth
Public Policy Research Institute
Texas A&M University
ebooth@ppri.tamu.edu
Office: +979.845.6754




On Jul 5, 2010, at 3:36 PM, Dani Tilley wrote:

> Hi,
> 
> I need to extract the first element of a matrix of coefficients and store
it on a variable, and repeat the process i times. I can set up the for loop
and do the storing, but I don't know how to access element [i,j] of a matrix
A.
> 
> In particular, my matrix is e(b), the vector of coefficients from a
regression with k explanatory variables. I tried -e(b)[1,1]- but that didn't
take me far.
> 
> Any help is appreciated.
> 
> Thanks,
> DF Tilley
> 
> 
> 
> 
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