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I have longitudinal data on individuals (id) surveyed in two years. Some individuals were not surveyed the second time. I would like to drop all outcomes on individuals surveyed only once so that I am left with a balanced data set.
How do I do this in Stata?
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This might do it for you:
The
by idwill execute the command following the colon separately for each value ofid, and_Nwill be the number of observations with thatid.