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st: egen command, multiplication


From   André Gyllenram <a_gyllenram@hotmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: egen command, multiplication
Date   Tue, 30 Apr 2013 14:00:06 +0200

Hello,

I have a simple problem. For every individual I want to compute the return of their investment from the beginning of the investment until the end.

My data looks like this

Individual   Year   Reurn
1            1       1,1
1            2       1,2
1            3       1,02
1            4       1,08

2            1       1,3
2            2       1,8
2            3       1,7

So in this example what i want to do is that i want to compute the total return for individual 1 and 2. For individual 1 I want to compute 1.1*1.2*1.02*1.08. And for individual 2 I want to compute 1.3*1.8*1.7. I have 270000 individuals.

Can I do this in a simple way. I would be easy to use the egen command. But egen cannot be combined in this way. Or at least i don't know how.

Kind regards
André 		 	   		  
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