Question Difficulty – How to Estimate Without Norming, How to Use for Automated Grading Ulrike Padó author 2017-09 text Proceedings of the 12th Workshop on Innovative Use of NLP for Building Educational Applications Joel Tetreault editor Jill Burstein editor Claudia Leacock editor Helen Yannakoudakis editor Association for Computational Linguistics Copenhagen, Denmark conference publication pado-2017-question 10.18653/v1/W17-5001 https://aclanthology.org/W17-5001/ 2017-09 1 10