Hello,
I have a dataset I couldn't create lag variable. The details are as follows:
It is a variable for each state and each year. So what I did was:
sort state year
gen V1=V[_n-1]
However, what I got in STATA is
weights not allowed
r(101);
Anyone have any idea what is going on? How can I create a lag variable in this case?
Thank you very much.
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