note 86300 added to book.math

This is the only function I searched that I did not find anywhere on the Internet. This function calculates standard normal cumulative distribution for a particular value. This is NORMSDIST(x) in MS-Excel or OpenOffice.org Calc program. <? function normalDist($zScore) { $p = floatval(0.2316419); $b1 = floatval(0.319381530); $b2 = floatval(-0.356563782); $b3 = floatval(1.781477937); $b4 = floatval(-1.821255978); $b5 = floatval(1.330274429); $t = 1/(1 + ($p * floatval($zScore))); $zx = (1/(sqrt(2 * pi())) * (exp(0 - pow($zScore, 2)/2))); $px = 1 - floatval($zx) * (($b1 * $t) + ($b2 * pow($t, 2)) + ($b3 * pow($t, 3)) + ($b4 * pow($t, 4)) + ($b5 * pow($t,5))); return $px; } ?> ---- Server IP: 209.41.74.194 Probable Submitter: 98.206.252.71 ---- Manual Page -- http://www.php.net/manual/en/book.math.php Edit -- https://master.php.net/note/edit/86300 Del: integrated -- https://master.php.net/note/delete/86300/integrated Del: useless -- https://master.php.net/note/delete/86300/useless Del: bad code -- https://master.php.net/note/delete/86300/bad+code Del: spam -- https://master.php.net/note/delete/86300/spam Del: non-english -- https://master.php.net/note/delete/86300/non-english Del: in docs -- https://master.php.net/note/delete/86300/in+docs Del: other reasons-- https://master.php.net/note/delete/86300 Reject -- https://master.php.net/note/reject/86300 Search -- https://master.php.net/manage/user-notes.php