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Re: st: Editing values in postestimation coefficient matrix


From   Scott Merryman <scott.merryman@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Editing values in postestimation coefficient matrix
Date   Wed, 5 Sep 2012 12:10:49 -0500

See -help ereturn post-

Example:
sysuse auto
qui reg mpg price weight gear
mat list e(b)
mat a = e(b)
qui reg mpg price weight head
mat list e(b)
mat b = e(b)
mat b[1,1] = a[1,1]
ereturn post b
mat list e(b)

Scott


On Wed, Sep 5, 2012 at 11:53 AM, ETHAN SHARYGIN <garba@sas.upenn.edu> wrote:
> Dear Statalisters,
>
> Has anyone discovered a way to alter the values in the coefficient
> matrix after a regression? I realize they can be converted to a
> regular matrix and manipulated-- but I need to use commands to work
> with the postestimation matrix e(b) so having them stored as a regular
> Stata matrix would not work.
>
> It seems that e(b) and other values in return/ereturn are stored
> somewhere special where mere mortal users can't toy with them. I'm
> hoping there are some superusers here who might know if it can be
> done, and how.
>
> (In short, I need to run two similar regressions and then calculate
> predictions using coefficients for a few of the variables from the
> first regression and coefficients for the the remainder of the
> variables from the second-- alternative approaches to achieve this end
> are welcome).
>
> Thanks, and regards,
> Ethan
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