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Re: st: RE: how to store the statistics calculated in a loop as a table?


From   Christopher Baum <kit.baum@bc.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: RE: how to store the statistics calculated in a loop as a table?
Date   Wed, 7 Dec 2011 21:48:10 -0500

<>
I just tried the collapse, it is really handy, it is amazing how stata
create so powerful commend. I guess my old way of programming in VB is
very narrow and restricted.

But I still wanted to know if there is anyway that I could store the
results I calculated in the loop as a table? Do I need to use matrix
related commend?

The following is the code:

forvalues i=1990 (1)2010 {
                forvalues n=1(1)6{

                             quietly sum  EI_t if
trade_date_yearformat==`i' &FF_group_rank_0==`n'
                             local s_EI=r(sum)
                             quietly sum  BE_t_1 if
trade_date_yearformat==`i' &FF_group_rank_0==`n'
                             local s_BE=r(sum)
                             local mean_EI_BE=`s_EI'/`s_BE'

             }
             }


How do I make stata to memorize the mean_EI_BE value that is
calculated after each loop , and at then end report all the mean_EI_BE
as a seperate table?


-------------------------------
webuse grunfeld, clear
egen quinq = cut(year), group(4) label
egen quincomp = group(quinq company), label
// quinq are time periods (quinquennia), company are units in this panel
tabstat invest kstock, by(quincomp) save
mata:
m = J(0,2,0)
for(i=1; i<=40; i++) {
	m = m \ st_matrix("r(Stat"+strofreal(i)+")")
}
m = m , m[. , 1] :/ m[. , 2]
st_matrix("Result", m)
end
mat li Result
---------------------------------
You can add the row labels (which are also saved by tabstat) if you wish.

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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