中国电影线上评分系统的改进

Improvement of Chinese films for on-line scoring system

针对中国电影线上评分不包括未参与调查的观影者评价信息的问题,提出一种基于评价参与率的评分系统改进方法。首先,通过断点回归设计(RDD)的方法建立以分歧点和分歧效应为核心的评分系统评价标准;然后,在一般计算电影线上评分的加权平均方法基础上,提出加入评价参与率的评分改进方法;最后,以2014—2016年中国市场上映的全部电影为样本进行实证研究。结果显示:改进评分经离差标准化后,分歧效应变化率小于或近似于0,而加权平均法的变化率在0.4左右,且标准化后改进评分的分歧效应小于或近似于加权平均法评分。因此,从分歧点和分歧效应的角度分析不同评分系统间的差异具有一定合理性和可操作性;改进方法理论上更接近于电影真实的口碑影响力,且消除量纲影响后具有更少的分歧效应,能够更加直观地反映一部电影在全部影片中的排序位置。

Aiming at the problem that the original on-line scoring system of Chinese films does not consider the information about the viewer who did not participate in the online survey,an improved scoring system based on evaluation participation rate was proposed.Firstly,an evaluation criterion of scoring system was established at the core of divergence and divergent effect based on the method of Regression Discontinuity Design(RDD).Secondly,distinguished from the weighted average method,an improvement method using the participation rate was put forward.Lastly,empirical study was conducted on the films released from 2014 to 2016 in China.The results show that the improved score s change rate of divergent effects after normalization of deviation is less than or approximate to 0,while the change rate of weighted average score is nearly 40%.Therefore,it is reasonable and feasible to analyze the differences between different scoring systems by using the divergent point and divergent effects;the improved score is closer to the real reputation influence of the film with less divergent effect after normalization,and can more intuitively reflect the sorting position of a film.