Dear friends
I have a problem on how to select observations from a
unbalanced panel data?
I mean, the original data is too big and I want only a
smaller section. If it is a balanced panel data, I can
for example choose 50% random part. But now it is a
unbalance panel data, I can't do that otherwise the
new data will suffer from "length bias". I think
first I need to randomly choose 50% of individuals
(duplicates drop id, force==>sample 50), but how I can
proceed next by using this unique id key index to
produce new panel data?
Thanks for tips!
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