@InProceedings{giorgi-EtAl:2018:EMNLP,
  author    = {Giorgi, Salvatore  and  Preoţiuc-Pietro, Daniel  and  Buffone, Anneke  and  Rieman, Daniel  and  Ungar, Lyle  and  Schwartz, H. Andrew},
  title     = {The Remarkable Benefit of User-Level Aggregation for Lexical-based Population-Level Predictions},
  booktitle = {Proceedings of the 2018 Conference on Empirical Methods in Natural Language Processing},
  month     = {October-November},
  year      = {2018},
  address   = {Brussels, Belgium},
  publisher = {Association for Computational Linguistics},
  pages     = {1167--1172},
  url       = {http://www.aclweb.org/anthology/D18-1148}
}