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From |
Nick Cox <njcoxstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Boxplots - avoiding the box in a strata with a small number of observations |

Date |
Tue, 4 Sep 2012 09:07:40 +0100 |

Allowing two or more -over()- options is characteristic only of -graph box-, -graph dot-, -graph bar- etc. It is not possible in practice with (a) -graph twoway- or (b) any command based on -twoway- such as -dotplot- (although (b) at least is programmable). -stripplot- (SSC) offers most if not of the flexibility you need. To concoct a problem similar to yours, I typed sysuse auto gen himpg = mpg > 20 Then after some experimentation, this plot stripplot weight , over(rep78) by(himpg) vertical box(barw(0.5) blcolor(gs8)) width(100) center stack height(0.4) seems adequate. -stripplot- helps because 1. Both -over()- and -by()- are supported, thus allowing two-way classifications. 2. If a group contains only one value, the box would be a bar of zero length, which Stata won't (can't) show visibly. 3. You can adjust the box colour to play down the boxes while keeping them visible. I think this is a good idea generally. 4. You can tinker with bin width, spacing of points and box width Nick N.B. One stratum, two or more strata. On Tue, Sep 4, 2012 at 1:37 AM, Richard Hiscock <richardjhiscock@gmail.com> wrote: > I have continuous data (plasma level of drug) in patients, who received a dose determined by body weight (in five strata), measured at three time points. > Whilst the lower strata have 40+ patients the highest two levels the number of patients is very small n = 5 & 2. > To graphically present the plasma levels I would prefer to show individual data points but using dotplots however the command doesn't seem to allow for over commands (with data now in the long form). > > dotplot plasma_level , over(time) over(wtstrata) > > I can achieve close to what I want using boxplots, however I feel that boxes for the strata with 5 & 2 only observations is not appropriate. Is there anyway to have individual data points displayed for these strata? The command I'm using in Stata 12 is > > gr box Baseline Firstdose Thirddose , over(wtstrata) > > Any help or other presentation suggestions would be much appreciated * * 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**:**Re: st: Boxplots - avoiding the box in a strata with a small number of observations***From:*Nick Cox <njcoxstata@gmail.com>

**References**:**st: Boxplots - avoiding the box in a strata with a small number of observations***From:*Richard Hiscock <richardjhiscock@gmail.com>

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