2Chang C C, Lin C J, LIBSVM.. A library for support vector nm- chines [OL]. 2009. 11.
3Lazrafdd P F, et al. The People s Choice: How the Votes' Makes Up His Mind in a Presidential Election [J]. New York: Columbia U- niversity Press, 1948: 151.
4M.Q.Hu and B.Liu. Mining and Summarizing Customer Reviews [C]. In ACM SIGKDD, 2004: 168- 177,.
5Bo Pang and Iillian Lee. Opinion mining and sentiment analysis [J]. Foundations and Trends in Information Retrieval, 2008, 2 (1 - 2) : 1 - 135.