Dear Stata Users,
Im using a microdata set. Im estimating aggregates with the data
set. The data set is unbalanced. A situation arises when I lag the variables by
sort PLANT YEAR STATE COUNTY ECOGROUP FIRM
quietly by PLANT: gen Ait1= aggregateprod[_n-1]
It generates missing values for the lag variable of the aggregate,
but there should a value(with the exception of the first year),
since Ait is the aggregate value by year. How can I change the
missing values to the actual values without doing a replace for each
year. I thank you in advance for all your help.
Sincerely,
Luis
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