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Re: st: Re: How to generate quantile categories by group/varlist?


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: How to generate quantile categories by group/varlist?
Date   Thu, 25 Oct 2012 09:33:45 +0100

Sounds like Indonesia!

UIi Kohler has written an -xtile()- function for -egen- that does
this; see the -egenmore- package (SSC).

Suppose that didn't exist. Some technique is shown by

egen group = group(province)
su group, meanonly

gen q_epc = .

quietly forval i = 1/`r(max)' {
                  xtile work = epc if group == `i' [fweight = weind],
nquantiles(5)
                  replace q_epc = work if group == `i'
                  drop work
}

drop group

See also

FAQ     . . . . . . . . . . Making foreach go through all values of a variable
        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
        8/05    Is there a way to tell Stata to try all values of a
                particular variable in a foreach statement without
                specifying them?
                http://www.stata.com/support/faqs/data/foreach.html

Nick

On Thu, Oct 25, 2012 at 6:13 AM, Alika Tuwo <alika.tuwo@gmail.com> wrote:

> I'm working on a national survey data and I'm trying to group
> expenditure per capita according to provincial (NOT national)
> quantiles.
>
> prov - code for province (33 unique values)
> ecp - expenditure per capita
> weind - individual weight
>
>
> If I were to group 'epc' by national quintiles I would use the command:
>
>  xtile q_epc = epc [fweight = weind], nquantiles(5)
>
> But what if I would like to generate quantile groups for each
> province? Is there any quick way to do this?  The 'by' option wouldn't
> work with 'xtile'. So far I've had to work on each province
> separately.
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