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

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

Subject |
st: RE: Re: Boxplot w/ 2nd y-axis and mean overlay (statalist-digest V4 #3456) |

Date |
Mon, 15 Jun 2009 17:22:52 +0100 |

I don't know StataCorp's views on this, but I have some of my own. A request to add means to box plots is sufficiently common that StataCorp may give in sooner or later, but what next? Means and confidence intervals? The trade-off between giving customers what they want and adding yet more complications to already complicated commands is not easy. Allan didn't spot my deliberate silence on my -stripplot- and second axes. As -stripplot is a wrapper for -twoway- it would support second axes, whether to good or not-so-good ends. Beware of box plots and log scales for different reasons, spelled out at http://www.stata.com/support/faqs/graphics/boxandlog.html The essence of the matter is that box(log()) and log(box()) are not necessarily identical. Nick n.j.cox@durham.ac.uk Allan Reese Further to Nick Cox's replies, you can add category means to boxplots as added text, but have to fiddle with the x positions since Stata treats the category axis differently. Eg, sysuse auto egen mmpg = mean(mpg), by(foreign) tab mmpg // to copy and round the values. graph box mpg, over(for) text(19.8 21 "*") text(24.8 80 "*") I don't think that's an adequate solution, and the question has been raised several times on Statalist. It would be good to have a "graph twoway box" plot, so that boxes can be intelligently combined with, eg, median smoothing lines. [Action StataCorp] I too wanted a second axis on a boxplot last week and found it's not allowed. Nick's contemnation of second axes is valid when graphs are superimposed despite having incompatible units, and I've seen examples of Procrustean spin to create "correlations" that way. Multiple scales on a single graph obstruct relating particular points to the appropriate scale. But it is perfectly reasonable to have right and left axes with different labelling and I cannot see why the software should deny multiple axes at any position. One use would be to label one axis with the log values and the other with natural numbers; my example would have labelled one axis with the range for one group (or variable) and the other axis with another range; you could make nested categories with the major groupings labelled at the top and the minor ones at the bottom; although Stata has always drawn axes outside the plotting area, traditional graphs have axes through the origin which may be within the plot. I even tried the graph editor, thinking it would pick up the axis as an object to copy. (Nah!) [Action StataCorp] From: "Michael Sorice" <msorice@tamu.edu> > I've created a boxplot summarizing three variables over 3 groups. The > command line looks like: graph box A1 A2 B1, over(group) > Variables A1 & A2 are on the same scale but B1 is on a larger scale. > Is there a way to put B1 on a 2nd y-axis? I'd like them all on one plot > and readable. I can only find a 2nd y-axis option for the "twoway" > command. > > Additionally, I'd like to add the mean to the boxplot. * * 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**:**st: Re: Boxplot w/ 2nd y-axis and mean overlay (statalist-digest V4 #3456)***From:*"Allan Reese (Cefas)" <allan.reese@cefas.co.uk>

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