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？可能的最高评级是多少？

Answer 1

您正在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和4，那么你的答案是满分10。如果你的答案是满分5，那么你的答案是满分5。$bayesian_rating，$avg_rating和$this_rating都是可比较的。

Answer 2

好吧，算出你的数学：

((18 * 3.7) + (6 * 4)) / (18 + 6)
(66.6 + 24) / (24)
90.6 / 24
3.775

所以它是1分中的3分...