Legislative hearing to consider S. 3305 : hearing before the Committee on Environment and Public Works, United States Senate, One Hundred Eleventh Congress, second session, June 9, 2010.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzes reviews to verify trustworthiness.