贝叶斯评级 [英] Bayesian Rating

问题描述

$avg_num_votes = 18; // Average number of votes in all products
 $avg_rating = 3.7; // Average rating for all products
$this_num_votes = 6; // Number of votes for this product
 $this_rating = 4; // Rating for this product


$bayesian_rating = ( ($avg_num_votes * $avg_rating) + ($this_num_votes * $this_rating) ) /    ($avg_num_votes + $this_num_votes);

echo round($bayesian_rating); // 3

3的意义是什么?可能的最高评分是什么?

解决方案

您正在将该产品的等级与所有产品中的等级进行比较，因此您的答案是一个等级.如果$ avg_rating和$ this_rating是3.7，而满分为10，则答案是4.如果答案是满分5，则答案是满分5.$ bayesian_rating，$ avg_rating和$ this_rating都是可比较的./p>

$avg_num_votes = 18; // Average number of votes in all products
 $avg_rating = 3.7; // Average rating for all products
$this_num_votes = 6; // Number of votes for this product
 $this_rating = 4; // Rating for this product


$bayesian_rating = ( ($avg_num_votes * $avg_rating) + ($this_num_votes * $this_rating) ) /    ($avg_num_votes + $this_num_votes);

echo round($bayesian_rating); // 3

What is the significance of 3? What is the highest possible rating?

解决方案

you're comparing the ratings for this product against the ratings in all products, so your answer is a rating. If $avg_rating and $this_rating are 3.7 and 4 out of 10, then your answer is out of 10. If it's out of 5, then your answer is out of 5. $bayesian_rating, $avg_rating, and $this_rating are all comparable.

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