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st: using loops in collapse command


From   Jocelyn Michael <michaeljocelyn31@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: using loops in collapse command
Date   Mon, 2 Apr 2012 10:35:12 -0400

I am a new stata user and have been trying to write a loop to accomplish a task.

My data looks like this:


id                 Year               Value 1
A               Jan1991             0.92
A               Feb1991             0.93
A               Mar1991             0.24
A               APr1991             0.83
..
..
B               Jan1991             0.67
B               Feb1991             0.45
..

What I am trying to achieve is to write a loop that multiplies value1
for each id and returns one number for each year - sort of like a
collapse command but instead of the sum, I want the product. That is
for A for 1991, (0.92*0.93*0.24*0.83).

Any help is greatly appreciated.

JM.
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