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st: Fun with switching point


From   Quang Nguyen <quangn@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Fun with switching point
Date   Wed, 7 Oct 2009 23:40:26 -1000

Dear all:

Suppose, I have the following data:

id      x
1      1
1      1
1      1
1      1
1      0
1      0
1      1
1      1
2      1
..

Now, I would like to generate a variable _y _such that _y_ takes the
ordering value of 1, 2, 3... as long as the corresponding _x_  takes
the same value as the previous observation. Otherwise,  _y_ is 0.
Specifically, from the above data, we have:

id      x        y
1      1
1      1         1
1      1         2
1      1         3
1      0         0
1      0         1
1      1         0
1      1         1
2      1         2
..

Can you suggest a way to do this in Stata?
--
"My father gave me the greatest gift anyone could give another person,
he believed in me." - Jim Valvano
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