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Re: st: Scale break in box plot


From   Rakesh Ghosh <rakeshgh@usc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Scale break in box plot
Date   Mon, 23 Dec 2013 09:24:55 -0800

Hi Scott

Thanks for alluding me to this paper. Although I am not getting exactly what I want but certainly I can insert a desirable scale break.


Thanks
Rakesh

On Dec 16, 2013, at 12:47 PM, Scott Merryman wrote:

> You will need to construct the box plots using -twoway- graphs.
> 
> The following example is adapted from Nick Cox's 2009 Stata Journal
> (9:3) article "Speaking Stata: Creating and varying box plots"
> 
> http://www.stata-journal.com/sjpdf.html?articlenum=gr0039
> 
> 
> sysuse lifeexp,clear
> replace lexp = 35 if country == "Haiti"
> egen median = median(lexp), by(region)
> egen upq = pctile(lexp), p(75) by(region)
> egen loq = pctile(lexp), p(25) by(region)
> egen iqr = iqr(lexp), by(region)
> egen upper = max(min(lexp, upq + 1.5 * iqr)), by(region)
> egen lower = min(max(lexp, loq - 1.5 * iqr)), by(region)
> twoway rbar med upq region, pstyle(p1) blc(gs15) bfc(gs8) barw(0.35) || ///
>  rbar med loq region, pstyle(p1) blc(gs15) bfc(gs8) barw(0.35) || ///
>  rspike upq upper region, pstyle(p1) || ///
>  rspike loq lower region, pstyle(p1) || ///
>  rcap upper upper region, pstyle(p1) msize(*2) || ///
>  rcap lower lower region, pstyle(p1) msize(*2) || ///
>  scatter lexp region if !inrange(lexp, lower, upper) & lexp > 50, ///
>  ms(Oh)  mla(country) mlabcolor(gs8) xscale(off)  legend(off) ///
>  yla(, ang(h)) ytitle(Life expectancy (years)) xtitle("") name(gr1,replace)
> 
> 
> scatter lexp region if !inrange(lexp, lower, upper) & lexp < 50, ylabel(35) ///
>  fysize(20) ytitle("") ms(Oh) mlabcolor(blue) mcolor(blue)  mla(country)  ///
>  xla(1 `" "Europe and" "Central Asia" "' 2 "North America" 3 "South
> America", ///
>  noticks) ytitle(Life expectancy (years), color(white))  yla(, ang(h))  ///
>  xtitle("")  name(gr2,replace)
> 
> graph combine gr1 gr2, col(1) xcommon imargin(zero)
> 
> 
> Scott
> 
> 
> 
> On Mon, Dec 16, 2013 at 1:24 PM, Rakesh Ghosh <rakeshgh@usc.edu> wrote:
>>>>> Dear Stata list members
>>>>> 
>>>>> I have a box plot with many outliers. I would like to insert a scale break to increase the box size and reduce the span of the outliers. I tried both of the options in this Stata scale break link (http://www.stata.com/support/faqs/graphics/scale-breaks/). While inserting a line will not work in my case because I have no break in data points, the second option does work when I create a box plot and a scatter plot and then combine them together.
>>>> 
>>>>> -graph box trafficdensity if trafficdensity>0 & trafficdensity<=125, over(county)-
>>>>> 
>>>>> However, the median, p25 and p75 are underestimated because I restrict the upper limit of the box plot, so it is not good for me. I will have to restrict the upper limit otherwise I will not get the plot of desirable size. Is there any way you can think how I can insert a break on the y axis?
>>>>> 
>>>>> Thanks for any suggestion.
>>>>> 
>>>>> Rakesh Ghosh
>>>>>> 
>>> 
>> 
>> 
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