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st: Re: Dear users of statalist


From   "Rodrigo A. Alfaro" <raalfaroa@gmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: Dear users of statalist
Date   Sun, 8 Jul 2007 07:47:30 -0400

findit mvsumm

R

----- Original Message ----- From: "Tobias Brütsch" <topsi@ihcn.ch>
To: <statalist@hsphsun2.harvard.edu>
Sent: Sunday, July 08, 2007 5:29 AM
Subject: st: Dear users of statalist



Dear users of statalist

For better understanding and learning STATA, I would like to ask you the
following question.

I have the Dataset like this:

DATE STOCK RETURN
01.01.01 XY +0.05
02.01.01 XY -0.035
03.01.01 XY 0.08
04.01.01 XY -0.045
...

For about 100 Stocks and 5 Years.

Now I wanted to generate a new variable with gives me, for each day, the sum
of returns of the stock over the following 31 days.

I did it with the following command:

Gen SUM= RETURN+RETURN[_n+1]+.....+RETURN[_n+31] if STOCK == STOCK[n-1]

I think that worked.

But now I wonder if that wouldn't be easier with an other command? Perhabs
with FOREVALUE or FOREACH, but I can't get the solution.

Could somebody give me a hint?

Thanks a lot

Tobi


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