Bryan W. Griffin <[email protected]> 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 <[email protected]> and Nick Cox
<[email protected]> 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
[email protected]
*
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