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  This procedure calculates the empirical distribution function (edf)
  of a set of data, evaluated at each input data point. The edf is
  the empirical equivalent of the cumulative distribution function.



Calling Sequence

  edf, data, x, y, [/plot, _extra = extra]


  data: A vector of data values

Keyword Parameters

  PLOT: Set to plot the results.
  _extra: Any extra kewyord passed to edf is forwarded to PLOT

Optional Outputs

  x: On output, the variable holds the values of data, in numerical order
  y: On output, the variable holds a vector. y[i] = Fraction(data < x)

Modification History

  June 2009: Written by Chris Beaumont

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