<>
bys id: keep if _N==5
HTH
Martin
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Debs Majumdar
Sent: Donnerstag, 16. Juli 2009 23:25
To: [email protected]
Subject: st: question regarding merging
Hi,
I am new to stata and was trying to figure out the best way to solve the
following question.
I have a dataset with id's of school children and their demographics at 5
time points.
The 1st timepoint has 800 id's, the second has 650,...the last one has 325
id's. Some id's are common to all timepoints.
How do I create a dataset which will have only those id's which are present
at all time points? I have created a variable 'time' which corresponds to
the # of id's at each point and I tried with breaking up the dataset into 5
datasets(one for each timepoint) and merging them using nokeep but that
didn't work.
Thanks,
Debs
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