Statistics function incorrectly computing median

[Miguel Garcia-Blanco]

> I took another look and found a method that is more consistent with
> the original algorithm. The original calculates the CDF from left to
> right.  So I added an equivalent calculation form right to left, and
> averaged the two results.
>
> I expect the result will be the same calculated by GNU's R.

I just did a quick test. The R output is still different (1st and 3rd 
quartiles), although there seem to be multiple definitions for sample 
quartiles [1]. Incidentally, Maxima gave the same results as R.

[1] http://mathworld.wolfram.com/Quartile.html

-Miguel 
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