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based on an earlier version of the Wolfram Language.
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gives the locus of the q^(th) quantile of the bivariate data, where the data have been ordered using convex hulls centered on ConvexHullMedian.
  • Outlying vectors are removed by repeatedly peeling off layers of convex hulls from the data until at most a fraction q are left.
  • interpolates between the convex hulls of the points remaining before and after the last layer is removed.