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st: panel data cross referencing bewtween variables in different time


From   "MoZo" <kitefisher88@live.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: panel data cross referencing bewtween variables in different time
Date   Sat, 6 Mar 2010 13:24:41 -0500

I have a panel dataset which was set up as follow:

ID	Year	X1	X2	X3
111   1990  89 	21	0
111	1991	29	53	0
111	1992	87	76	1
111	1993	87	98	1
111	1994	45	88	0
222	1990	98	88	0
222	1991	98	44	0
222	1992	45	71	0
.
.
.
.
999	1990	76	98	0
999	1991	54	43	0
999	1992	65	32	0
999	1993	65	87	1
999	1994	76	32	0

I want to do simple calculation referencing to one variable X3. For example,
sum X1 for ID (panel) if the panel's X3=1 in ANY year. I can't find a
command I can make reference to a variable that may occur any time. For
example, in this data sample, I want to all X1 for all ID whose X3 is 1 in
ANY year. 
Thank you in advance. 

Mike 

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