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st: Display one observation

From   Skipper Seabold <>
Subject   st: Display one observation
Date   Wed, 15 Sep 2010 13:52:57 -0400


Say I have a list of sum values by year.  Something like

year cusum
2000 2
2000 4
2000 6
2000 8
2000 .
2000 .
2001 5
2001 .
2001 6
2001 12

How can I loop through and display only the last cusum by year?  This
seems like a common operation.  Working from how I would do this in
most other languages, I tried to write a loop to place the non-missing
values into a vector by year and then access the vector at the point
of its last observation, but no go.  Any ideas?


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