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Re: st: name conflict in posting a matrix


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: name conflict in posting a matrix
Date   Tue, 10 Jul 2012 14:23:53 +0100

What you are trying to do here is not clear. You are -bootstrap-ping
_b which you can do directly, e.g .

. bootstrap _b , reps(2) : regress mpg foreign, nocons

You don't need to write a program to do that. Conversely, what is the
point of the program? It just does the same estimation twice and you
don't ask -bootstrap- to pay attention to its results.

By the way, the stuff like

local s1 = 1
local s2 = 2
local s3 = 3

is pure indirection.  Your code can be simplified down to

sysuse auto,clear

cap prog drop ddd
program ddd, eclass
        tempname b1 b2 b3 betas
        reg price foreign, nocons
        mat `b1'=e(b)
        matrix coleq `b1' = eq1

        reg price foreign, nocons
        mat `b2' =e(b)
        matrix coleq `b2' = eq2

        mat `b3'=1

        mat `betas' = `b1', `b2', `b3'
        ereturn post `betas'
end



On Mon, Jul 9, 2012 at 8:53 PM, Emmanouil Mentzakis
<ementzakis@gmail.com> wrote:
> Dear all,
>
> I am trying to -ereturn post- a matrix in order to bootstrap it but
> get an error. I d be grateful if anyone could point to my mistake.
> Below is an example.
>
> Thank you
>
> Regards
> Manos
>
>
> *** Example ***
>
> sysuse auto,clear
>
> cap prog drop ddd
> program ddd, eclass
>         tempname b1 b2 b3 betas
>         reg price foreign, nocons
>         local s1=1
>         mat `b`s1''=e(b)
>         matrix coleq `b`s1'' = eq`s1'
>
>         reg price foreign, nocons
>         local s2=2
>         mat `b`s2''=e(b)
>         matrix coleq `b`s2'' = eq`s2'
>
>         local s3=3
>         mat `b`s3''=1
>
>         mat `betas' = `b1', `b2', `b3'
>         ereturn post `betas'
> end
>
> bootstrap _b, reps(2): ddd
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