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Re: Re: st: Append new row to existing matrix


From   "Sandy Y. Zhu" <sandy.zhu@yale.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: Re: st: Append new row to existing matrix
Date   Sat, 24 Mar 2012 22:44:58 -0400

Hi Mr. Baum:

Thank you so much! I will try it out right away!

I hope you have a nice day!

On Sat, Mar 24, 2012 at 9:40 PM, Christopher Baum <kit.baum@bc.edu> wrote:
> <>
> Re the proposed logic
>
> forv i=1(1)917 {
>     capture quietly reg rprf rmrf smb hml if event==`i'
>     if _rc matrix b=[.,.,.]
>     else matrix b=e(b)
>     if `i'==1 matrix betas=b
>     else matrix betas=(betas \ b)
>     }
>
> -statsby- does sound like a more sensible way to assemble these results. One thing to note about Stata matrices, though: the conditional
> logic for the first time through is not necessary, as you can say
>
> matrix betas = (nullmat(betas) \ b)
>
> Kit
>
> Kit Baum   |   Boston College Economics & DIW Berlin   |   http://ideas.repec.org/e/pba1.html
>                             An Introduction to Stata Programming  |   http://www.stata-press.com/books/isp.html
>  An Introduction to Modern Econometrics Using Stata  |   http://www.stata-press.com/books/imeus.html
>
>
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-- 
Yours sincerely,

Sandy Y. Zhu

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