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从豆瓣电影的打分规则想到的

今天去看了里约大冒险,客观的说,片子还凑合吧,回来在豆瓣上打了三颗星。让我感觉比较坑爹的是,这个片现在在豆瓣上是8.9分,我比较了一下,功夫熊猫是7.9,两部马达加斯加分别是7.6和7.5,同一个公司同一个团队制作的冰川世纪的三部分别是8.3、7.9、8.2。以上拿来对比的片儿,我觉得都比今天看的这个要强些,不知道为啥这个的打分这么高,因为是3D就牛逼咩?类似的结果出现在时光网上。

是不是电影刚上映的时候打分都要比过一段时间后的偏高些?

网上搜了一下,没找到豆瓣和时光网的评分标准,姑且认为是简单的算平均数,并且不排除电影刚上映,有人会请人专门去刷分。

相比较而言,IMDB的打分就真是太专业了,不过IMDB的打分主要是为了进行排名,很多新上映的片子要等到足够多的人去投票以后才能得到一个比较公正的分数,并不太适用于豆瓣,因为豆瓣只是单纯的评分,不进行排名。

其实要想得到一个相对准确客观的评分也许对豆瓣来说并不是什么难事儿,它那上面不是有影评功能么,在算分的时候把写过影评的打分权重弄高一些,那些没写过的,谁知道你是不是被雇来刷分的,权重弄低些,这样的分数就有道理多了。比如写过影评的人记为x,每个人打过得分就是记为x1,x2……xn,这些人打过的分数就可以直接相加为∑xi (1),对于没有什么参与单纯的直接打分的人,因为豆瓣的打分规则比较简单,从1到5颗星,一颗星就对应2分,可以记所有打1星的人为y1,2星的为y2…,5星的为y5,他们的权重取个对数,log10y1*2+log10y2*4+…log10y5*10 (2), 总分就是(1)+(2),人数就是n+log10(y1y2…y5),最后算出来得分就是总分/人数。

这样的好处就是可以大大削弱刷分的人的影响,并且认可看过片并且愿意付出时间写影评的人给出的分数更有价值。不过缺点就是以10为底取对数会使得那些专门写影评的人对片子分数影响太大,1个人比得上不写的10个,2个人比得上100个,3个人1000个…这个,可以改小点…他们自己可以统计一下多少比较合适。另外要知道豆瓣上的热门影片打分的人数一般也就是以10万为单位计,而其中会写影评的人可能只占到百分之一二的样子,比如说国王的演讲95086人评分,664条评论,百分比0.69%,盗梦空间272425人评分,4082条评论,百分比1.5%左右。这样可能就会有人雇些枪手专门写影评,比以前请人刷分更简单了。解决方式就是,每篇影评后面不都是有“有用/没用”的选项么,你可以请人来写影评,但是你的影评有没有用是由大家来说了算的,老写没用的枪文影评,可以不断地把这些人的权重降低…

当然,以上都是一些比较简单幼稚的想法,不过豆瓣算是一个社区,社区里的人都应该有参与进来的权利,但是不意味着每个参与进来的人都应该有一样的权利,豆瓣完全可以就电影打分这个功能就细化到每个用户的权重都不一样,比如用户以前对其他影片的影评、电影评分的活跃度什么的都可以作为赋予不同权重的参考标准,再具体的东西就不是这儿讨论的东西了,哥就去看了个电影而已,养专业人士是让他们玩儿蛋的么?另外一个比较关键的地方是,用户也许不需要知道具体的权重标准,太复杂的东西呈现给用户都不好,这些最好对所有的用户都是透明的。

现在豆瓣评分的功能基本已经沦落为看分数低的肯定是烂片,但是分数高的也不见的多好看,按照那个分数去看电影,我十次能有七八次郁闷,说不好吧也不是,就是期望太高失望比较大,狂给心里添堵。

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  1. 2011年5月24日07:54 | #1

    豆瓣的评分制度一直是一个谜

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  1. 2011年5月14日20:01 | #1