I am working with panel data and am trying to create a
variable that will count the number of unique values
an existing variable has over overlapping moving
windows (i.e. I have a list of products sold to
customers and wish to find the total number of
customers over 5-year moving windows). This seems to
fall between the stata commands UNIQUE and MOVSUMM,
but I can't really think of a syntax that will provide
the results I'm looking for. I would appreciate any
help you may offer.
Arik
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