php - 贝叶斯评级

Question

$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？最高评分是多少？

Answer 1

您要将此产品的评级与所有产品的评级进行比较，因此您的答案是评级。如果 $avg_rating 和 $this_rating 是 3.7，满分 10 分中有 4 分，那么你的答案是满分 10。如果是满分 5，那么你的答案是满分 5。$bayesian_rating、$avg_rating 和 $this_rating 都是可比较的。