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st: capturing the sizes of the sequences of countinous (uninterrupted) values equal to 1


From   massimiliano stacchini <mastacchini@yahoo.it>
To   statalist@hsphsun2.harvard.edu
Subject   st: capturing the sizes of the sequences of countinous (uninterrupted) values equal to 1
Date   Wed, 30 Nov 2011 09:24:31 +0000 (GMT)

Dear users,


I have a huge dataset. The rows identify the person ID (i) (i=1,...,n) while in columns there are the reference dates TIME(t) (t=1,...,w). Each cells contain the value 1 or 0 (zero), alternatively.

I should create a variable (LENGTH) varying both over ID and TIME. 
For each i of ID(i) in t of TIME(t), LENGTH should captures the number of continuous (uninterrupted) values which are equal to 1 in the interval of cells starting from the reference data t of TIME and moving backwards to the previous reference dates.
In other terms , LENGTH should capture for each (i) of ID and for each (t) of TIME the number of s in T (t-s) identifying cells having values equal to 1 (i.e., the size of the sequence of uninterrupted 1 moving backwards to the previous reference dates).

Can you help me on how can I get this result with Stata?

Thanks


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