I have a dataset akin to this
User Date Value
A 2012-01-01 4
A 2012-01-02 5
A 2012-01-03 6
A 2012-01-04 7
B 2012-01-01 2
B 2012-01-02 3
B 2012-01-03 4
B 2012-01-04 5
I want to create a lag of Value, respecting User.
User Date Value Value.lag
A 2012-01-01 4 NA
A 2012-01-02 5 4
A 2012-01-03 6 5
A 2012-01-04 7 6
B 2012-01-01 2 NA
B 2012-01-02 3 2
B 2012-01-03 4 3
B 2012-01-04 5 4
how can i do this in stata??
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