Hi,
I tried to drop missing values period by period, in 120 periods. In other
words, in period 1, I want to drop the observations if dependent variables
have missing values only in period 1; while in period 2, drop the
observations if dependent variables have missing values only in period 2,
should keep those that missing in period 1 but not missing in period 2. For
instance:
In period 1, I want to keep id 1; in period 2, I want to keep id 1 &2.
Does anyone knows how to do that? Thanks a lot.
Best,
Xixi Lin
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