<?php function poisson($mu,$shift) { #returns array of poisson probabilities for scores $x = []; for ($i = 1 ; $i <= $shift ; $i++ ) { array_push($x,0.0); } $pcdf = 0.0; $a = exp(-1*$mu); while ( $pcdf < 0.999999 || count($x) < 5 ) { array_push($x,$a*($mu**(count($x)-$shift))/facdef(count($x)-$shift)); $pcdf+=end($x); } return $x; } echo poisson(1,0); ?>
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