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.
so awesome. i have known a few ... never needed one to save my life ... thank goodness ...but so glad so many do know how to do that. and save us from other issues, mishaps, diseases or whatever we might need them for. thanks!!