Thumbs up? Sentiment Classification using Machine Learning Techniques

@inproceedings{Pang2002ThumbsUS,
  title={Thumbs up? Sentiment Classification using Machine Learning Techniques},
  author={Bo Pang and Lillian Lee and Shivakumar Vaithyanathan},
  booktitle={Conference on Empirical Methods in Natural Language Processing},
  year={2002}
}
We consider the problem of classifying documents not by topic, but by overall sentiment, e.g., determining whether a review is positive or negative. [] Key Result We conclude by examining factors that make the sentiment classification problem more challenging.
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