st: RE: Quintile lines in Area chart (or any chart)

 From "Nick Cox" To Subject st: RE: Quintile lines in Area chart (or any chart) Date Tue, 8 Jun 2004 18:52:34 +0100

```It is possible in Stata. One way to do it is this.
The following program displays quintiles:

program quintiles, rclass
version 8
syntax varname(numeric) [if] [in] [aweight fweight]
marksample touse
qui count if `touse'
if r(N) == 0 error 2000

su `varlist' [`weight' `exp'] if `touse', meanonly
local quint "`r(min)',"
local q "`r(min)' "
local max `r(max)'
_pctile `varlist' [`weight' `exp'] if `touse', nq(5)
forval i = 1/4 {
local quint "`quint'`r(r`i')',"
local q "`q'`r(r`i')' "
}
local quint "`quint'`max'"
local q "`q' `max'"
di as res "`quint'"
return local q "`q'"
end

Then you can type the quintiles in a call to -xline()-
(or -yline()-) on any suitable graph.

Also see -eqprhistogram- on SSC. With the option -bin(5)-
you will see the blocks defined by quintiles.

Nick
n.j.cox@durham.ac.uk

Branco Ponomariov

> I am not very familiar with the graphing functions in stata
> yet, and I have the following problem:
>
> For some basic stats (frequencies) I also need to make it
> visible how are
> the observed values concentrated/dispersed across different
> quintiles. I
> have to present the data as an area chart format and have the
> quintile lines
> drawn from the x axis up to the frequency line - e.g. to show
> at which value
> the first quintile end and so on. So far I have not found a single
> stats/spreadsheet package that can do that - excel, spss,
> sigma plot cannot
> do that. Is this possible in stata and how?

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```