Splusplus: A Feature-Rich Two-stage Classifier for Sentiment Analysis of Tweets Li Dong author Furu Wei author Yichun Yin author Ming Zhou author Ke Xu author 2015-06 text Proceedings of the 9th International Workshop on Semantic Evaluation (SemEval 2015) Preslav Nakov editor Torsten Zesch editor Daniel Cer editor David Jurgens editor Association for Computational Linguistics Denver, Colorado conference publication dong-etal-2015-splusplus 10.18653/v1/S15-2086 https://aclanthology.org/S15-2086/ 2015-06 515 519