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  1. <?php
  2.     public function confidence_score($ups, $downs){
  3.         if ($ups == 0){
  4.            return -$downs;
  5.         }
  6.    
  7.         $n = $ups + $downs;
  8.         $z = 1.64485; #1.0 = 85%, 1.6 = 95%
  9.         $phat = $ups / $n;
  10.             return ($phat+$z*$z/(2*$n)-$z*sqrt(($phat*(1-$phat)+$z*$z/(4*$n))/$n))/(1+$z*$z/$n);
  11.     }
  12. ?>
');