An Improved Method of Sentiment Analysis of Chinese Web Reviews

The web reviews contain a lot of features of the evaluation object and express the viewpoints or attitudes of the reviewers. Therefore, analyzing them and identifying the sentiment polarity will be significantly important and valuable. This paper uses the appearing-frequency of noun words to extract the aspect words and uses some semantic rules to extract opinion words to form the aspect -- opinion word pairs. We use the sentiment orientation-point mutual information (SO-PMI) algorithm to calculate the sentiment strength of opinion words and get the semantic orientation of the opinion words and improved the algorithm. With the Chinese reviews of doctors from the medical websites www.39.net and www.chan120.net, experimental results demonstrate the validity of the proposed method.