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.
Although I enjoyed his other book,Write to market more, this book still contains a lot of valuable info for launching a book. Some of the info will be very obvious to authors, such as the importance of a good mailing list, other snippets, less so. Chris carefully takes the reader through a book launch, starting from pre launch. Written in a very easy going style, you can almost imagine you are engaging in a virtual book launch.