st: identifying lengths of runs in a binary variable

[Faye Turner <Faye.Turner@cancer.org.uk>]

I have a binary variable (coded with 0's and 1's).

I would like to generate a variable that records the frequency of 
consecutive 1's.

A new run of 1's would begin after a zero.

E.g

binvar     newvar
1            3
1            3
1            3
0
0
1            4
1            4
1            4
1            4
0

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