-by- is a short cut that you can replace with a -for[each/values]- loop.
This is an example with the auto data:
sysuse auto
forvalues n=1/5 {
xtile temp`n'=price if rep78==`n', nq(4)
}
egen myvar = rsum(temp1-temp5)
It loops over the values of rep78 (or any grouping variable) creating
quantiles for each level of rep78 in a new variable. That gives you five (in
this case) separate variables: one for each level of rep78. Depending on
what you want to do next, you can then combine them all into a single
variable using -egen, rsum-.
Best,
Lee Sieswerda
Lee Sieswerda, Epidemiologist
Thunder Bay District Health Unit
[email protected]
-----Original Message-----
From: [email protected]
[mailto:[email protected]]
Sent: Wednesday, July 16, 2003 3:38 PM
To: [email protected]
Subject: st: constructing subsamples at every year
Dear Statalist users:
I would like to construct subsamples at every year based on a ranking of a
variable. xtile allows us to do it for the entire sample but it cannot be
used with the by command. Is it possible to get around this?
Thank you,
Ayla
Note: Hypothetically what I would like to do is
by year: xtile newvar=oldvar nq(4)
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