Feature Subsumption for Opinion Analysis Ellen Riloff author Siddharth Patwardhan author Janyce Wiebe author 2006-07 text Proceedings of the 2006 Conference on Empirical Methods in Natural Language Processing Dan Jurafsky editor Eric Gaussier editor Association for Computational Linguistics Sydney, Australia conference publication riloff-etal-2006-feature https://aclanthology.org/W06-1652/ 2006-07 440 448