SURVO MM Help System (web edition)

plots multidimensional data as star symbol plots.
Reference: Chambers,Cleveland,Kleiner,P.A.Tukey: Graphical Methods for
           Data Analysis. The Wadsworth Statistics/Probability Series, 1983
           (pp. 158-161)
Each observation of m active variables is represented as a set of rays
whose directions are equally spaced around the circle and the length
of the ray corresponding to the variable x is
     (1-c)*(x-xmin)/(xmax-xmin)+c .
c is a constant with the default value 0.2. Another value for c can be
selected by entering the TYPE specification in the form TYPE=STARS,c .
The order of activate variables in the stars is determined by the alpha-
betic order of their mask symbols and secondarily by their order in the
data set.
The general layout of the star symbol plots in the plotting region is
the same as that of Chernoff's faces. The LABEL and FSIZE specifications
are available as well (See FACES?).

  M = more information on multivariate plotting 

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