I was overwhelmed too (here's simple wrong solution #1, here's simple wrong solution #2, here's incredibly complicated but more correct statistical solution #3

I was overwhelmed too (here's simple wrong solution #1, here's simple wrong solution #2, here's incredibly complicated but more correct statistical solution #3 that you may not understand) but since this is relevant to my day job and we use PHP, I did find this: http://www.derivante.com/2009/09/01/php-content-rating-confidence/ http://www.derivante.com/2009/09/01/php-content-rating-confi... I'm not a statistician so I can't speak to the correctness of this implementation.