So long as 1989 is a value for some other
zip, you can
fillin zip year
replace count = 0 if _fillin
Nick
[email protected]
Heather Taffet Gold, PhD
> I've been looking all around, asking around, etc, and I can't
> seem to find
> out how to create new observations within my dataset.
>
> Here are the specifics of my problem:
> I have counts of cases by zip code and year (one observation
> with count for
> each zip, and year). It happened that I ended up with "missing"
> observations if the count of cases was zero in a year, so my
> data look
> something like this
> zip year count
> 06010 1986 1
> 06010 1987 2
> 06010 1988 2
> 06010 1990 7
> ...
>
> How would I create a new observation for this zipcode in 1989
> that has a
> count of 0? I need to be able to create some lagged variables
> by year and zip.
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