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st: Counting


From   Hugh Colaco <hmjc66@gmail.com>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: Counting
Date   Mon, 23 Mar 2009 17:08:51 -0400

Dear Statalisters,

I'm including below my data as it is now and what I want to get. The
data is sorted based on "id" and "year" in ascending order. There are
115 different "id", so "id" ranges from 1-115. "year" ranges from 1974
to 2001 although data is not available from 1974 for all observations
(as you can see below). Basically, I want to create this new variable
"years_code" that captures the number of consecutive years the same
code occurs (as shown below). As you can see, "code" sometimes changes
for a given "id".



Data currently				What I want			
id	year	code		id	year	code	years_code
1	1994	6		1	1994	6	0
1	1995	6		1	1995	6	1
1	1996	6		1	1996	6	2
1	1997	6		1	1997	6	3
1	1998	6		1	1998	6	4
1	1999	6		1	1999	6	5
1	2000	6		1	2000	6	6
1	2001	6		1	2001	6	7
2	1985	6		2	1985	6	0
2	1986	6		2	1986	6	1
2	1987	6		2	1987	6	2
2	1988	6		2	1988	6	3
2	1989	6		2	1989	6	4
2	1990	6		2	1990	6	5
2	1991	6		2	1991	6	6
2	1992	6		2	1992	6	7
2	1993	6		2	1993	6	8
2	1994	6		2	1994	6	9
2	1995	6		2	1995	6	10
2	1996	6		2	1996	6	11
2	1997	6		2	1997	6	12
2	1998	6		2	1998	6	13
2	1999	6		2	1999	6	14
2	2000	6		2	2000	6	15
2	2001	6		2	2001	6	16
3	1974	2		3	1974	2	0
3	1975	2		3	1975	2	1
3	1976	2		3	1976	2	2
3	1977	2		3	1977	2	3
3	1978	2		3	1978	2	4
3	1979	2		3	1979	2	5
3	1980	2		3	1980	2	6
3	1981	2		3	1981	2	7
3	1982	2		3	1982	2	8
3	1983	2		3	1983	2	9
3	1984	2		3	1984	2	10
3	1985	2		3	1985	2	11
3	1986	2		3	1986	2	12
3	1987	2		3	1987	2	13
3	1988	2		3	1988	2	14
3	1989	4		3	1989	4	0
3	1990	4		3	1990	4	1
3	1991	4		3	1991	4	2
3	1992	4		3	1992	4	3
3	1993	4		3	1993	4	4
3	1994	4		3	1994	4	5
3	1995	4		3	1995	4	6
3	1996	4		3	1996	4	7
3	1997	4		3	1997	4	8
3	1998	4		3	1998	4	9
3	1999	4		3	1999	4	10
3	2000	4		3	2000	4	11
3	2001	4		3	2001	4	12

Thanks in advance.
-- 
Hugh
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