Statistical Estimation of Word Acquisition with Application to Readability Prediction Paul Kidwell author Guy Lebanon author Kevyn Collins-Thompson author 2009-08 text Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing Philipp Koehn editor Rada Mihalcea editor Association for Computational Linguistics Singapore conference publication kidwell-etal-2009-statistical https://aclanthology.org/D09-1094/ 2009-08 900 909