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I need to calculate 5-star ratings like the one on Amazon website. I have done enough search to find what is the best algorithm, but I am not able to get a proper answer. For example, if these are the ratings
5 star - 252 4 star - 124 3 star - 40 2 star - 29 1 star - 33 totally 478 reviews
Amazon has calculated this to be "4.1 out of 5 stars". Can anyone tell me how this figure is arrived at? I am not able to get this just by doing average.
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Summary star ratings are an average of a provider's question level star ratings. Patient star ratings are calculated by dividing the patient's aggregate mean score by 20. For clients using only one question in the patient star rating, the star rating would simply be the individual question score, divided by 20.
The rating system keeps track of what it knows about each player by constructing a law to describe the player's playing strength. A law is a probability distribution. The rating system assigns a law to each player. The player's law describes the rating system's knowledge of the playing strength of the player.
Calculate 5 Star Rating Average Using SUMPRODUCT FunctionSUMPRODUCT(C5:C10,D5:D10) >> First, SUMPRODUCT Function will multiply the Rating column by No. of Ratings column. Then, it will sum all the results of multiplication. SUM(D5:D10) >> Shows us the sum of E5 to E10 cells in the Rating column.
That's a weighted average, where you weigh each rating with the number of votes it got:
(5*252 + 4*124 + 3*40 + 2*29 + 1*33) / (252+124+40+29+33) = 4.11 and change If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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