st: RE: panel data cross referencing bewtween variables in different time

["Martin Weiss" <martin.weiss1@gmx.de>]

<>

*************
clear*

inp int(ID Year) byte(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
end

list, noo

bys ID: egen maxperid=max(X3==1)
by ID: egen totalX1=total(X1*maxperid)
l, noo sepby(ID)
*************


HTH
Martin

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of MoZo
Sent: Samstag, 6. März 2010 19:25
To: statalist@hsphsun2.harvard.edu
Subject: st: panel data cross referencing bewtween variables in different
time 

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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