A naive question. I just insalled cipolate to fill missing values for one
variable. The documentation tells me that interpolation is done using two
points before and two points after the missing value. That said, why is it
that the procedure requires a second variable? In other words, for replacing
missing values in variable y, why we need to include variable x in the
command?
. cipolate y x, gen(yprime).
I am confused. Thanks for your advice.
Joe
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