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

From: Albert Crosby <acrosby_at_sdale.org>
Date: Wed, 04 Jun 2008 10:50:53 -0500


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!

Thanks!

Albert Crosby
Springdale Public Schools
Springdale, Arkansas

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