Re: st: Scale break in box plot

[Nick Cox <njcoxstata@gmail.com>]

Thanks for the mention. Anyone using code ideas from that paper should
know of the published correction at

http://www.stata-journal.com/article.html?article=gr0039_1

Nick
njcoxstata@gmail.com


On 16 December 2013 20:47, Scott Merryman <scott.merryman@gmail.com> 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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