An Empirical Analysis of Formality in Online Communication Ellie Pavlick author Joel Tetreault author 2016 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal pavlick-tetreault-2016-empirical 10.1162/tacl_a_00083 https://aclanthology.org/Q16-1005/ 2016 4 61 74