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Re: st: Scale break in box plot
Nick Cox <firstname.lastname@example.org>
Re: st: Scale break in box plot
Tue, 17 Dec 2013 11:15:01 +0000
Thanks for the mention. Anyone using code ideas from that paper should
know of the published correction at
On 16 December 2013 20:47, Scott Merryman <email@example.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"
> 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)
> On Mon, Dec 16, 2013 at 1:24 PM, Rakesh Ghosh <firstname.lastname@example.org> 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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