Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
Excellent step by step walk through of Excel. Good for intermediates who may have skipped some steps along the way and for beginners who want a higher degree of proficiency. Good use of humor to lighten the load and to make the chapters flow.