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From |
Richard Hiscock <richardjhiscock@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 21:56:34 +1000 |

Thanks Nick for your help. The last method will provide me with the detail I need thanks Richard On 4 Sep 2012, at 18:54, Nick Cox wrote: > You can combine two or response variables with -by()- within -stripplot-. > > stripplot Baseline Firstdose Thirddose , by(wtstrata, row(1)) box vertical > > would be a start > > On Tue, Sep 4, 2012 at 9:07 AM, Nick Cox <njcoxstata@gmail.com> wrote: >> 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/ * * 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>

**Re: st: Boxplots - avoiding the box in a strata with a small number of observations***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: Boxplots - avoiding the box in a strata with a small number of observations***From:*Nick Cox <njcoxstata@gmail.com>

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