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.
This is NOT what I was expecting! It's nothing more than mathematical equations and references to the main book. I thought it might have some useful conversion tables or SOMETHING useful for a home machinist! What a waste. I can't find one single thing in this book that would be useful to me. Will be selling my copy as quickly as possible if anyone will buy it! (wish I didn't!!!)