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Re: st: xtile and "by" question


From   "Sergio Correia" <sergio.correia@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: xtile and "by" question
Date   Tue, 8 May 2007 18:28:40 -0400

Well, it seems that you should hack around that problem.
Something like this may help

* 1) Let's create a variable with the levels, and save them on a local macro
egen levels = group(date city)
levelsof levels, local(levels)

* 2) Now let's run a loop
gen output = .
foreach l of local levels {
	xtile temp=income if levels==`l'
	replace output = temp if output==.
	drop temp
}

I tried it on some dummy data and it appeared to work.

Best,
Sergio

On 5/8/07, Edgard Alfonso Polanco Aguilar <e-polanc@uniandes.edu.co> wrote:
Hello everybody,

I'm working with a database which consists on income by month and
region. I need to classify the income by percentiles by city and month
because there's a wide dispersion on income levels across cities, to the
point that the highest income in one is on the median of another. I know
the command of choice for this task is xtile, but Stata doesn't allow me
to use it with "by" like in "by city date: xtile var=income nq(10)". I'm
working in Stata 9 SE for Windows.

Thaks!

Edgard


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