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st: question regarding merging

From   Debs Majumdar <>
Subject   st: question regarding merging
Date   Thu, 16 Jul 2009 14:24:54 -0700 (PDT)


 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.




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