NORMDIST Function

NORMDIST.js

// Copyright (c) 2012 Sutoiku, Inc. (MIT License)

function NORMDIST(x, mean, sd, cumulative) {
  // Check parameters
  if (isNaN(x) || isNaN(mean) || isNaN(sd)) return '#VALUE!';
  if (sd <= 0) return '#NUM!';

  // Return normal distribution computed by jStat [http://jstat.org]
  return (cumulative) ? jStat.normal.cdf(x, mean, sd) : jStat.normal.pdf(x, mean, sd);
}