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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 13:17:42 +0100 |

The difference between the two methods can be bridged by a -reshape-. Nick On Tue, Sep 4, 2012 at 12:56 PM, Richard Hiscock <richardjhiscock@gmail.com> wrote: > 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/ * * 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: 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>

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

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