On Stopwords, Filtering and Data Sparsity for Sentiment Analysis of Twitter Hassan Saif author Miriam Fernandez author Yulan He author Harith Alani author 2014-05 text Proceedings of the Ninth International Conference on Language Resources and Evaluation (LREC’14) Nicoletta Calzolari editor Khalid Choukri editor Thierry Declerck editor Hrafn Loftsson editor Bente Maegaard editor Joseph Mariani editor Asuncion Moreno editor Jan Odijk editor Stelios Piperidis editor European Language Resources Association (ELRA) Reykjavik, Iceland conference publication saif-etal-2014-stopwords https://aclanthology.org/L14-1265/ 2014-05 810 817