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A statistic defined to improve the Kolmogorov-Smirnov Test in the Tails.
See also Anderson-Darling Statistic
References
Press, W. H.; Flannery, B. P.; Teukolsky, S. A.; and Vetterling, W. T.
  Numerical Recipes in FORTRAN: The Art of Scientific Computing, 2nd ed.  Cambridge, England: Cambridge
  University Press, p. 621, 1992.