jstat/jstat — pull request #91 by jamescgibson (2014-09-02 17:23:38+00:00)
Title: Fix issue #88, Problem with jStat.studentt.inv

Added tests for the studentt.pdf, .cdf, and .inv methods. Fixed an issue
with the .inv method (always returned positive values).

(The Student's T Distribution is symmetric about 0, so any cumulative value of less than 0.5, rather than 0, will correspond to a negative value)