st: How to randomly pick one observation from all?

[Yanjun Bao <ybao1@uic.edu>]

Hi, there:

We have say, by one id, four observations under a variable.  We want STATA 
to randomly pick one observation each time it is asked.  We want to use the 
randomly picked observation for each id in regression.

Any information will be greatly appreciated!  Thanks.

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