Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
Hi Mark, I enjoyed reading your book. It’s very informative and easy to read and understand. I will be recommending it to my students in my Bird Photography class at our U3A on the Gold Coast in Australia. Cheers, Brian