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

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

Subject |
st: RE: Plotting the MEAN on a box plot |

Date |
Mon, 23 Feb 2009 12:20:04 -0000 |

You can always check the archives to see what "got through". There is no need for any doubt on that point. On your question, this isn't any easier than it was. One reason is that box plots are based on the assumption that you want medians, not means. Another is that -graph box- and -graph hbox- are not members of the -twoway- family, so you can't superimpose -twoway- graphs. There is an alternative, however, in -stripplot- from SSC. This shows some technique, although much else is possible: sysuse auto, clear egen mean = mean(mpg) , by(foreign) gen foreign2 = foreign + 0.3 stripplot mpg, over(foreign) stack height(0.2) /// box(barw(0.15)) boffset(0.3) vertical /// addplot(scatter mean foreign2, ms(D)) egen loq = pctile(mpg), p(25) by(foreign) egen upq = pctile(mpg), p(75) by(foreign) stripplot mpg, over(foreign) /// box(barw(0.15)) vertical ms(none) /// addplot(scatter mean foreign, ms(D) || /// scatter mpg foreign if !inrange(mpg, loq, upq)) This code produces two different designs, neither utterly standard. The first is a dot plot with boxes and means offset. The second is a box plot but with means added and all data points shown outside the boxes. My own bias is that box plots too often let down both analyst and audience by suppressing too much detail in the tails. Only if I have say 30 or 70 boxes rather than 3 or 7 do I want as much reduction as box plots typically give. -stripplot- has its own prejudices too, presumably to be blamed on its author. In particular, it doesn't support a mix of colours for different boxes -- "bladders are shown in maroon" -- presuming that to the alert reader the text labelling is signal enough. I've not tried subverting that via the Graph Editor, as I've never wanted it, but it may be possible. Nick n.j.cox@durham.ac.uk Neil Martin **Posting to this list is new for me. I thought I had submitted this question two days ago but I can't find it in the archive... That is to say, sorry if this is a repost.** I am interested in producing a figure of vertical box plots comparing groups of four variables across three strata and then across two more strata. I'm very happy with the figure I've managed to produce this way and I would now like to add the mean values superimposed on the boxes themselves. I know this topic has been covered previously on this listserve: (http://www.stata.com/statalist/archive/2003-06/msg00080.html) but I'm having trouble interpreting what the final answer was on this issue. It seemed like the implications were 1) try to overlay a figure of the means, or 2) use another software package. All things being equal, I would very much like to use the figure I have now but I don't fully understand how I would overlay the means. I am using version 10.1 on the Mac. I'm not sure how much this will help things but I am plotting my variable (dose) according to first a type data collected (data1), second over the type of treatment plan (plan1), and finally over a broad target criteria (internal). My code is as follows: graph box dose if oar==1, over(data1, gap(50)) over(plan1, gap(300)) over(internal, gap(500)) box(1, fcolor(dknavy)) box(2, fcolor(forest_green) lcolor(forest_green)) box(3, fcolor(dkorange) lcolor(dkorange)) box(4, fcolor(maroon) lcolor(maroon)) medtype(marker) medmarker(msize(vtiny) msymbol(smplus)) marker(1, mcolor(dknavy)) marker(2, mcolor(forest_green)) marker(3, mcolor(dkorange)) marker(4, mcolor(maroon)) ytitle(% of total volume) caption(bladder) legend(rows(1)) scheme(s2color8) xsize(9) ysize(7) Notably, I can also produce a dot plot of the means according to the same grouping as above using: graph dot (mean) dose if oar==1, over(data1, gap(50)) over(plan1, gap(300)) over(internal, gap(500)) But the figure is oriented horizontally and I don't know the command which allows me to overlay the two (if such a thing is even possible). * * 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/

**Follow-Ups**:**st: RE: RE: Plotting the MEAN on a box plot***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**References**:**st: Plotting the MEAN on a box plot***From:*"Neil Martin" <nmartin@hsph.harvard.edu>

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