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st: RE: Create a Running Count Variable?
From
Nick Cox <[email protected]>
To
"'[email protected]'" <[email protected]>
Subject
st: RE: Create a Running Count Variable?
Date
Fri, 20 May 2011 19:57:05 +0100
bysort Fid (Chid) : gen NUML = sum(LOWB[_n - 1])
Nick
[email protected]
Don Ruby
Suppose I have the following data, where NUML is the variable I want to create.
+---------------------------------------------------------+
| Fid CHid YOB LOWB NUML |
|----------------------------------------------------------|
1. | 1 11 80 1 0 |
2. | 1 12 82 0 1 |
3. | 2 21 78 1 0 |
4. | 2 22 85 1 1 |
5. | 2 23 88 1 2 |
+---------------------------------------------------------+
Where Fid is a family id, CHid is a child id, YOB is year of child's
birth, LOWB is an indicator for whether the child was born with low
birth weight, and NUML is the number of LOWB siblings born previously.
How can I create this running count variable, NUML?
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