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.
After the huge hype of the recent NY Times profile on the author I was excited to experience this writer, but I found it frustratingly unreadable. Maybe the wrong book - there are several. I must be missing something.