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Re: st: linear interpolation
scott, you may use
by fip year: gen N = _N
list if _N >1
to see the culprits. you will have to eliminate them somehow.
if your groups are uniquely identified by
fip age race sex
then you need to create some kind of an id variable for each such
identified group, and then to -tsset id year- and finally –tsfill-.
see help on -egen- with the group option to accomplish this task. note
that it is quite likely to have, let's say, two white males aged 25 in
the state of georgia so again the tsset based on id may fail. i am
surprised you do not have something like a unique case id.
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