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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: Re: Displaying mean in boxplot (weight & subgroup) |

Date |
Tue, 14 Oct 2008 18:26:03 +0100 |

Good questions. Question 1. -stripplot- does not support two or more -over()- options. But I owe to Hermione Granger a trick that makes that less of a limitation than it should be. (Economists and econometricians are reminded that referring to this as the Granger trick may well be misunderstood.) Use an -over()- and -by()- in this way: stripplot mpg, over(foreign) by(rep78, col(1) compact note("")) /// subtitle(, pos(9) placement(e) nobexpand bcolor(none) ring(1)) /// box(bfcolor(ltblue)) scheme(s1color) ytitle(Repair record and car type) Note that the -subtitle()- option is not a suboption of -by()-. Hermione would want me to emphasise that you have to get this just right. Question 2. -stripplot- does not support weights. That is tacit in the help and explicit in the code. As author, I have never wanted them to date. However, there is a clear possibility that if you want -box- or -bar- information you would want that to be based on appropriate weights. The best you can do at present is either or both of * Cloning -stripplot- and adding them yourself to the code. * Calculating the required information upstream of -stripplot- and using its -addplot()- option to show that, in the spirit of previous examples in this thread. Nick n.j.cox@durham.ac.uk Aca N.T. Some other questions came up in mind: 1. How to create such graph by another subgroup? This would look like producing a conventional boxplot using -gr hbox var1, over(var2) over(var3)- 2. Is it possible to take weight into account when using stripplot? On Mon, Oct 13, 2008 at 4:01 PM, Nick Cox <n.j.cox@durham.ac.uk> wrote: > The second example, like the first, requires that -mean- exists as a > variable first, > e.g. from > > egen mean = mean(mpg), by(foreign) > > Thanks to Martin for the correction. > > Aca N.T. > > Thanks Nick, it works well. I didnt get any error message as Martin > did.. > > On Mon, Oct 13, 2008 at 5:12 AM, Martin Weiss <martin.weiss1@gmx.de> > wrote: > >> Is "mean" defined somewhere in this code? I get "r(111)" "variable > mean not >> found"... > > "Nick Cox" <n.j.cox@durham.ac.uk> > >>> Example of orthodox box plot follows. N.B. that this requires prior >>> installation of -egenmore- from SSC. >>> >>> sysuse auto, clear >>> >>> egen adju = adju(mpg), by(foreign) >>> >>> egen adjl = adjl(mpg), by(foreign) >>> >>> egen loq = pctile(mpg), by(foreign) p(25) >>> >>> egen upq = pctile(mpg), by(foreign) p(75) >>> >>> stripplot mpg, /// >>> over(foreign) ms(none) box(bfcolor(ltblue)) yla(, noticks) pstyle(p1) >>> /// >>> addplot(rcap adjl adjl foreign, horizontal pstyle(p1) /// >>> || rcap adju adju foreign, horizontal pstyle(p1) /// >>> || rspike upq adju foreign, horizontal pstyle(p1) /// >>> || rspike loq adjl foreign, horizontal pstyle(p1) /// >>> || scatter foreign mpg if !inrange(mpg, adjl, adju), mcolor(navy) >>> /// >>> || scatter foreign mean, ms(D) mcolor(navy) msize(*2)) > > Nick Cox > >>> One way to do this through marker symbols, as requested, is through >>> -stripplot- from SSC. >>> >>> sysuse auto, clear >>> >>> egen mean = mean(mpg), by(foreign) >>> >>> stripplot mpg, over(foreign) box stack centre height(0.2) ms(sh) >>> addplot(scatter foreign mean, ms(Dh) msize(*3)) >>> >>> With more work, you can come arbitrarily close to more conventional >>> forms of the box plot. > > Martin Weiss > >>> Admittedly, my earlier solution did not give you the dot you were >>> looking >>> for, but a reference line. If you have Stata 10, fire up the graph >>> editor >>> afterwards, use the -add marker- tool and place the marker onto the >>> reference line. Then highlight the reference line and kill it... >>> If -gr box- were part of the -twoway- family of graphs, one could >>> imagine >>> overlaying it with a -scatteri- to get the mean onto the graph more >>> reliably >>> than this... >>> >>>> ********** >>>> sysuse auto, clear >>>> su price, mean >>>> graph box price, box(1, fcolor(none)) yline(`r(mean)') >>>> ********** > > Aca N.T. > >>>>> Does anyone know how to put mean (preferably marked as dot) within >>> >>> the >>>>> >>>>> box using -gr box-? * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**Re: st: Re: Displaying mean in boxplot (weight & subgroup)***From:*"Aca N.T." <acant29@gmail.com>

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