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Re: st: ereturn question [Stata 8]


From   jpitblado@stata.com (Jeff Pitblado, StataCorp LP)
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: ereturn question [Stata 8]
Date   Tue, 03 May 2005 18:17:37 -0500

Bryan W. Griffin <bwgriffin@GeorgiaSouthern.edu> asks about getting access to
a element of a matrix in the e() results:

> Running Stata 8.2
> 
> I am running a model in gllamm, and I want to access and save results from 
> one of the matrices. When I type
> 
> matrix list e(nu)
> 
> I get this result:
> 
> e(nu)[1,2]
>          c1      c2
> r1   5550   1850
> 
> I would like to be able to display and save one value at a time, such as
> 
> di "what here?"
> 
> to get 5550. With regression coefficients one can type "di _b[IV]" to 
> obtain a particular value. How do I issue the di command to get only r1,c1 
> instead of both values?

Both Richard Williams <Richard.A.Williams.5@ND.edu> and Nick Cox
<n.j.cox@durham.ac.uk> suggest the following:

> mat nu = e(nu)
> di nu[1,1]

But they also ask if this is possible without defining a new matrix.  The
answer is yes, use the -el()- matrix function:

	. di el(e(nu),1,1)

Note that this is allowed with any matrix in e() except for e(b) and e(V);
these two exceptions are special matrices that the el() function does not have
access to, but you can use [eqname]_b[indepvarname] system variable for the
elements of e(b) (and similarly use _se for the standard errors which are the
square roots fo the diagonal elements of e(V)).

--Jeff
jpitblado@stata.com
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