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st: many-to-many merge
I'm wondering whether there is some way to do a many-to-many merge in
the following sense:
eg. for some id, I have 2 observations in data set a, and 3
observations in data set b; how can I merge a and b to get a new data
set with 6 observations for this id(all the possible combinations of
the observations from a and b)?
What comes to my mind is to reshape one data set to a wide one to make
the id a unique identifier for merge, and then reshape the resulting
data set back to a long one.
I'm curious about easier ways to do this. Thanks in advance for any suggestion.
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