[Objective] This study aims to build an effective prediction mechanism for online ratings, with the help of Web surfers’ comments. [Methods] We proposed a model with the following modules: Web users’comment acquisition, predictive variable acquisition, prediction analysis and the prediction results evaluation. We retrieved 30 movies of different types and user’s comments from the Web. 27 movies were used to build the model, which were then examined with the remaining movies. [Results] We employed the stepwise regression to select variables, which included the number of raters, the number of participants posting comments, the number of people who wanted to watch the moive and the sentiment value of the positive comments. The prediction results were quite close to the IMDb scores, and the maximum and the minimum differences were 0.0644 and 0.0227. [Limitations] The sample size, the accuracy of sentiment features, and compatibility of the model could be improved. [Conclusions] The proposed model effectively predicts movie scores and detects the “water army” online.
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