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st: RE: Re: RE: Re: -pieplot- available from SSC


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Re: RE: Re: -pieplot- available from SSC
Date   Wed, 14 Oct 2009 17:40:00 +0100

Thanks for that. By the way, it may be worth mentioning -- for anyone picking up the radar/spider aspect of your question -- that radar or spider charts are parallel coordinate plots rendered in polar coordinates and that -parplot- from SSC offers parallel coordinate plots. 

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

José Maria

As always, very useful. Thanks a lot.

Nick Cox

> The question of radar or spider plots has arisen before. Typing
>
> . findit radar
>
> would have pointed you to Adrian Mander's -radar- on SSC. Two generic 
> problems for radar or spider graphs are comparing values that are not 
> close by and comparing with numeric scales, which are usually only tacit.
>
> Various graphs for circular data are included in -circular- on SSC. 
> Although set up for data measured in degrees, they are applicable to some 
> extent to data on other circular scales. I gave a talk on this package at 
> the London users' meeting in September.
>
> I don't agree that data that are seasonal (diurnal, etc.) are usually 
> better plotted in circular diagrams. In fact 80 or 90 years ago, Brinton 
> and Karsten were scathing about such graphs in their compendia,  e.g.
>
> Karsten, K. 1923. Graphs and charts. New York: Prentice-Hall, p.237 "When 
> the clock-chart has been well and carefully drawn, it is ready for the 
> waste-basket."
>
> Karsten is perhaps more widely remembered for having had the basic idea of 
> a hedge fund; these days that may not seem much of an honour.
>
> For more constructive suggestions on plotting seasonal data -- adaptable 
> to other cycles -- see
>
> SJ-9-2  gr0037  . . . . . . . .  Stata tip 76: Separating seasonal time 
> series
>        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. 
> Cox
>        Q2/09   SJ 9(2):321--326                                 (no 
> commands)
>        tip on separating seasonal time series
>
> SJ-6-3  gr0025  . . . . . . . . . . . . Speaking Stata: Graphs for all 
> seasons
>        (help cycleplot, sliceplot if installed)  . . . . . . . . .  N. J. 
> Cox
>        Q3/06   SJ 6(3):397--419
>        illustrates producing graphs showing time-series seasonality
>
> The earlier of these papers is accessible to all in .pdf form on the Stata 
> Journal website, as it came out just over three years ago. It's one of the 
> Speaking Stata columns I'm most fond of.

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