sendwithus/confidence — pull request #5 by EricPKerr (2014-04-08 22:26:31+00:00)
Title: Probability percentage approximation from the configured zScore

95% is the confidence for a zscore of 1.96, but if this is configured to be another z value the message will be incorrect as it changes this percentage.

The private zScoreProbability method is adapted from a polynomial approximation in:
Ibbetson D, Algorithm 209
Collected Algorithms of the CACM 1963 p. 616