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


From   Alika Tuwo <alika.tuwo@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: How to generate quantile categories by group/varlist?
Date   Thu, 25 Oct 2012 15:59:07 +0700

Hi Nick,

Thanks for your help, I really appreciate it and would definitely give
it a try. And yes indeed it is Indonesia! I guess the '33 provinces'
gave it away, eh?

Cheers,
Alika

On Thu, Oct 25, 2012 at 3:33 PM, Nick Cox <njcoxstata@gmail.com> wrote:
> 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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