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st: RE: [Graphics] how to set the length of an axis?


From   philippe van kerm <philippe.vankerm@ceps.lu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: [Graphics] how to set the length of an axis?
Date   Fri, 20 Mar 2009 11:07:12 +0100

You could draw a first histogram with no data ( if t==0 ) to get the left axis. And move the histogram for t==1 into the loop (without axes) as suggested earlier to get all periods on same scale.

For example

/*--------------------------------------------*/

twoway (hist wage if t==0 , fcolor(gs14) plotr(m(zero)) ///
 graphregion(margin(zero) color(white)) xlabel(0 " ") xtitle("") ///
 ylabel(0(5)20, grid gmin gmax)  horiz) , legend(off)  saving(a, replace)
 local list "a.gph"

 local t=1
 while `t'<=15 {
      twoway (hist wage if t==`t', fcolor(gs14) plotr(m(zero)) ///
        graphregion(margin(zero) color(white)) xlabel(0 "`t'") xtitle("") ///
        yscale(off)  xtitle("") ylabel(0(5)20 , grid gmin gmax)  horiz) ///
        (line med q95 q5 ti if t==`t', sort xaxis(2) yaxis(2) ylabel(0(5)20, axis(2)) ///
        lcolor(black black black) lwidth(thick thick thick) lpattern(solid solid solid) ///
        xscale(off axis(2)) yscale(off axis(2)) ) , legend(off)  saving(a`t', replace)
         local list "`list' a`t'.gph"
         local t=`t'+1
 }
 graph combine `list', imargin(0 0 0 0) row(1) graphregion(color(white))
 note(t, pos(6))
 /*--------------------------------------------------*/

Philippe

> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-
> statalist@hsphsun2.harvard.edu] On Behalf Of Antoine Terracol
> Sent: Friday, March 20, 2009 9:07 AM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: [Graphics] how to set the length of an axis?
>
> Dear _all,
>
> I was asked if I could reproduced a graphic like
> http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=109
> in Stata.
>
> Using nlswork.dta, I was able to produce the graph whose code is pasted
> below.
>
> As you can see, the years are not evenly spaced on the x-axis. In
> particular, the part between "1" and "2" is much smaller than the rest.
>
> I understand that, in fact, the total width of the sub graphs are all
> equal, and that the visual difference is due to the presence of the y
> axis and its legend in the first sub-graph.
>
> Is there a way to set the length of the axis in the first sub graph,
> or,
> alternatively, to produce a graph with just the y-axis in such a way
> that it would look nice?
>
> Best,
> Antoine
>
> /*--------------------------------------------*/
> clear
> set scheme s2mono
> webuse nlswork.dta, clear
> g wage=exp(ln_wage)
> su wage, de
> drop if wage>r(p99)
> egen t=group(year)
> g ti=t+runiform()
> g ti2=ti^2
> g ti3=ti^3
> qreg wage ti ti2 ti3
> predict med
> qreg wage ti ti2 ti3 , quantile(.95)
> predict q95
> qreg wage ti ti2 ti3 , quantile(.05)
> predict q5
>
> twoway (hist wage if t==1 , fcolor(gs14) plotr(m(zero))
> graphregion(margin(zero) color(white)) xlabel(0 "1") xtitle("")
> ylabel(0(5)20, grid gmin gmax)  horiz) (line med q95 q5 ti if t==1,
> sort
> xaxis(2) yaxis(2) ylabel(0(5)20, axis(2)) lcolor(black black black)
> lwidth(thick thick thick) lpattern(solid solid solid) xscale(off
> axis(2)) yscale(off axis(2)) plotr(m(zero))) , legend(off)  saving(a,
> replace)
> local list "a.gph"
>
> local t=2
> while `t'<=15 {
>      twoway (hist wage if t==`t', fcolor(gs14) plotr(m(zero))
> graphregion(margin(zero) color(white)) xlabel(0 "`t'") xtitle("")
> yscale(off)  xtitle("") ylabel(0(5)20 , grid gmin gmax)  horiz) (line
> med q95 q5 ti if t==`t', sort xaxis(2) yaxis(2) ylabel(0(5)20, axis(2))
> lcolor(black black black) lwidth(thick thick thick) lpattern(solid
> solid
> solid) xscale(off axis(2)) yscale(off axis(2)) ) , legend(off)
> saving(a`t', replace)
>         local list "`list' a`t'.gph"
>         local t=`t'+1
> }
> graph combine `list', imargin(0 0 0 0) row(1) graphregion(color(white))
> note(t, pos(6))
> /*--------------------------------------------------*/
>
> *
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