Re: st: Place in quartiles based on prior year - panel data

[Nick Cox <njcoxstata@gmail.com>]

Sounds like

webuse grunfeld, clear
egen g_t = group(time)
gen tokeep = .
su g_t

forval t = 1/`= r(max) - 1' {
       local T = `t' + 1
       pctile work = invest if g_t == `t', n(4)
       xtile result = invest if g_t == `T', cut(work)
       replace tokeep = result if g_t == `T'
       drop work result
}

Nick

On Tue, Mar 27, 2012 at 9:51 PM, Bill McDonald <mcdonald.1@nd.edu> wrote:
> I have a variable, lets say mpg in a panel of data.  I would like to put each observation into a quartile based on quartile cutoffs from the prior year.  I know how to brute force a solution by have not been able to figure out some combination of xtile, egenmore or cutoff that will categorize the variable based on the prior year quartile cutoffs.  Any help would be appreciated.
>
>
> Bill
>
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