Re: [R] Creating a "simple" Radar/Spider Plot from Statgraphics

From: Jim Lemon <jim_at_bitwrit.com.au>
Date: Thu, 05 Jun 2008 20:17:23 +1000

Albert Crosby wrote:
> I'm new to R - and trying to create a plot similiar to the spider plot at
> http://www.statgraphics.com/eda.htm#radar .
>
> I can't figure out several things... most of which I would think would be
> straightforward....
>
> How can I change the lines for each series plotted instead of creating a
> filled area?
>
> How can I get the labels for each of the radial axes at the outside of the
> plot instead of on a small circle in the middle?
>
> Is there an easy way to get a legend like the sample plot?
>
> Here's my attempt so far, using the USJudgeRating dataset... I'm sure that
> there's something simple that I'm missing....
>
> stars(USJudgeRatings[1:2,1:9],locations = 0:1, scale=FALSE,
> draw.segments=FALSE,
> col.segments=1:5,col.stars=0,key.loc=0:1,
> main="Radar/Spider Plot\nSee
> http://www.statgraphics.com/eda.htm#radar",full=TRUE)
>
> What I really want to do is plot a dataset like this one:
>
> Year Below Basic Proficient Advanced
> 2005 10 25 30 35
> 2006 8 21 41 30
> 2007 15 24 48 14
> 2008 14 19 42 25
>
> and get a graphic with 4 superimposed stars of different colors superimposed
> showing the shape of the distribution for each year. The data is
> percentsges of students scoring in each category, summing to 100. There are
> actually scores for Literacy and Math, so I might display 8 radii instead of
> the 4 above. And the dataset/graph would be repeated for comparing various
> subpopulations.
>
> Any pointers would be welcomed!
>
Hi Albert,
Try this and it may be what you want:

# this just gets your data
radplot<-read.table("../radarplot.dat",header=TRUE) library(plotrix)
radial.plot(radplot[,2:5],label.pos=c(0,pi/2,pi,3*pi/2),rp.type="p",   labels=c("Below","Basic","Proficient","Advanced"),main="Performance") # let the legend extend beyond the plot
par(xpd=TRUE)
legend(-50,50,radplot[,1],col=1:4,lty=rep(1,4)) par(xpd=FALSE)

Jim



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