

   stars {base}                                 R Documentation

   SSttaarr PPlloottss aanndd SSeeggmmeenntt DDiiaaggrraammss ooff MMuullttiivvaarriiaattee DDaattaa

   DDeessccrriippttiioonn::

        Star plots or segment diagrams are created on the cur-
        rent graphics device.

   UUssaaggee::

        stars(x, full = TRUE, scale = TRUE, radius = TRUE, labels =
              dimnames(x)[[1]], locations = NULL, xlimit = NULL, ylimit = NULL,
              len = 1, colors = NULL, key.loc = NULL, key.labels = NULL,
              draw.segments = FALSE, draw.axes = FALSE, ...)

   AArrgguummeennttss::

          x: matrix of data.  One segment plot will be produced
             for each row of the matrix.  Missing values (`NA')
             are allowed, but they are treated as if they were
             0.

       full: logical flag: if `TRUE', the segment plots will
             occupy a full circle.  Otherwise, they occupy the
             (upper) semicircle only.

      scale: logical flag: if `TRUE', the columns of the data
             matrix are scaled independently so that the maxi-
             mum value in each column is 1 and the minimum is
             0.  If `FALSE', the presumption is that the data
             have been scaled by some other algorithm to the
             range [0,1].

     radius: logical flag: in `TRUE', the radii corresponding
             to each variable in the data will be drawn.

     labels: vector of character strings for labeling the
             plots.  Unlike the S function `stars', no attempt
             is made to construct labels if `labels = NULL'.

   locations: two column matrix with the x and y coordinates
             used to place each of the segment plots.  If
             `locations' is `NULL' the segment plots will be
             placed in a rectangular grid.

     xlimit: vector with the range of x coordinates to plot.

     ylimit: vector with the range of y coordinates to plot.

        len: scale factor for the length of radii or segments.

     colors: vector of integers, each of which specifies  a
             color for one of the segments.  Ignored if
             `draw.segments = FALSE'

    key.loc: vector with x and y coordinates of the unit key.

   key.labels: vector of character strings for labeling the
             segments of the unit key.  If omitted, the second
             component of `dimnames(x)' is used, if available.

   draw.axes: logical flag: if `TRUE' axes are added to the
             plot.

        ...: any other arguments, typically arguments to `par'.

   DDeettaaiillss::

        Missing values are treated as 0.

        Each star plot or segment diagram represents one row of
        the input `x'.  Variables (columns) start on the right
        and wind counterclockwise around the circle.  The size
        of the (scaled) column is shown by the distance from
        the center to the point on the star or the radius of
        the segment representing the variable.

        Only one page of output is produced.

   NNoottee::

        This code started life as spatial star plots by David
        A. Andrews.  See <URL:
        http://www.stat.rice.edu/~andrewsd/software/soft-
        ware.html>.

   AAuutthhoorr((ss))::

        Thomas S. Dye

   EExxaammpplleess::

        data(mtcars)
        stars(mtcars[, 1:7], len = 0.8, key.loc = c(12, 2),
              main = "Motor Trend Cars", full = FALSE)

        stars(mtcars[, 1:7], len = 0.8, key.loc = c(12, 2),
              main = "Motor Trend Cars", draw.segments = TRUE)

        data(USJudgeRatings)
        stars(USJudgeRatings, labels = abbreviate(case.names(USJudgeRatings)),
              key.loc = c(13, 1.5), main = "Judge not ...", len = 0.8)

