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# st: AW: RE: AW: AW: Adding the mean to a boxplot

 From "Martin Weiss" To Subject st: AW: RE: AW: AW: Adding the mean to a boxplot Date Fri, 7 May 2010 18:14:59 +0200

```<>

" Often it will even be ambiguous which mean goes with which group."

Let`s make it less ambiguous, then:

*************
sysuse bplong, clear
su bp if sex, mean
loc myfirstmean=r(mean)
loc myfirstname "female"
su bp if !sex, mean
graph box bp, over(sex) ///
yli(`r(mean)' `myfirstmean')  ///
yla(`myfirstmean' "`myfirstname'"  ///
`r(mean)' "male", angle(zero))
*************

HTH
Martin

-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Nick Cox
Gesendet: Freitag, 7. Mai 2010 15:57
An: statalist@hsphsun2.harvard.edu
Betreff: st: RE: AW: AW: Adding the mean to a boxplot

In essence, this is a quick but dirty way to show means. You get one horizontal line for each group mean, which is usually less subtle graphically than people want. Often it will even be ambiguous which mean goes with which group.

To do it better, you need very low-level programming or to use -graph twoway- to construct your box plot. Very full detail on the second way is given in

SJ-9-3  gr0039  . . . . . . . . Speaking Stata: Creating and varying box plots
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N.
J. Cox
Q3/09   SJ 9(3):478--496                                 (no
commands)
explains how to use egen to calculate the statistical
ingredients needed for box plots and variations of box
plots; shows the use of twoway to then create the plots

This post earlier today expands on some related issues:

<http://www.hsph.harvard.edu/cgi-bin/lwgate/STATALIST/archives/statalist.1005/date/article-332.html>

Nick
n.j.cox@durham.ac.uk

Martin Weiss

*************
sysuse bplong, clear
su bp if sex, mean
loc myfirstmean=r(mean)
su bp if !sex, mean
graph box bp, over(sex) ///
yli(`r(mean)' `myfirstmean') yla(`r(mean)' `myfirstmean')
*************

Martin Weiss

Something tells me this is my code, not Nick`s. He might have cited it in his http://www.stata.com/statalist/archive/2009-06/msg00495.html post?

st: RE: Re: Boxplot w/ 2nd y-axis and mean overlay
>>>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
Date 	  Sun, 14 Jun 2009 18:16:01 +0100

<snip> <snip>

"Additionally, I'd like to add the mean to the boxplot.  Is there a way
to do so?"

***
sysuse bplong, clear
su bp, mean
graph box bp, over(sex) ///
yli(`r(mean)') yla(`r(mean)')

Suppose, instead, I wanted to place a marker (x, for example) representing the mean for males, and a marker representing the mean for females on the boxplot. How could this be accomplished?

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```