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 analyses reviews to verify trustworthiness.
A wonderful, erudite and nuanced study, highly recommended. (On a side note, if you want to understand and appreciate Paul Tillich, this book is immensely helpful.) The german original can be found here: [...]