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.
Great book and very informative, but a bit too advanced for a real beginner. A lot of focus on figures very quickly. The basic techniques felt a bit skimped. Would be better for someone with some ability and an interest in figures.