Learning to Predict Engagement with a Spoken Dialog System in Open-World Settings Dan Bohus author Eric Horvitz author 2009-09 text Proceedings of the SIGDIAL 2009 Conference Patrick Healey editor Roberto Pieraccini editor Donna Byron editor Steve Young editor Matthew Purver editor Association for Computational Linguistics London, UK conference publication bohus-horvitz-2009-learning https://aclanthology.org/W09-3935/ 2009-09 244 252