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


From   Christopher Baum <kit.baum@bc.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   re: Re: st: Append new row to existing matrix
Date   Sat, 24 Mar 2012 21:40:08 -0400

<>	
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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