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st: Running Product Function

From   Yuval Arbel <>
To   statalist <>
Subject   st: Running Product Function
Date   Sun, 9 Dec 2012 22:53:15 +0200

Dear Statalisters,

I appreciate very much your assistance in the following question:,

I'm looking for an equivalent function for -gen y1=sum()- which will
calculate running product for each point in time

In fact, what I would like to calculate is a running geometric mean

Note also that -gen y2=prod()- does not work (i.e., stata does not
identify the function). Only -egen y2=prod()- works, but it generates
only one product for each panel, and this is not what I need.

Finally, I tried the -amean- command,, but it simply gives summary
statistics of different means, and it is not a function..
Dr. Yuval Arbel
School of Business
Carmel Academic Center
4 Shaar Palmer Street,
Haifa 33031, Israel
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