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st: Dear users of statalist


From   Tobias Brütsch <topsi@ihcn.ch>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Dear users of statalist
Date   Sun, 8 Jul 2007 11:29:45 +0200

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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