quickselect() and quickselectITeration() (./src/percentile.js)
--------------------------------------------------------------

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Copyright (c) 2018, Vladimir Agafonkin

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mwu() (./src/mann-whitney.js) and wilcoxon() (./src/wilcoxon.js)
----------------------------------------------------------------

- The asymptotic p-value estimation and zero-correction is derived from SciPy
- Versions of their own implementation of `mwu()` and `wilcoxon()` are 
  also bundled in `./reference/*.py`, pared down to match the options
  we baked in.

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/src/ppf.js is a direct translation from C++ of a bit of the Cephes library
---------------------------------------------------------------------------

License: 3-clause BSD
  Distributed under 3-clause BSD license with permission from the author,
  see https://lists.debian.org/debian-legal/2004/12/msg00295.html

  Cephes Math Library Release 2.8:  June, 2000
  Copyright 1984, 1995, 2000 by Stephen L. Moshier

  This software is derived from the Cephes Math Library and is
  incorporated herein by permission of the author.

  All rights reserved.

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  modification, are permitted provided that the following conditions are met:
      * Redistributions of source code must retain the above copyright
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      * Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in the
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      * Neither the name of the <organization> nor the
        names of its contributors may be used to endorse or promote products
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