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His research addresses language understanding or technologies which relate to it, such as knowledge representation, reasoning under uncertainty, and learning.
Recently he has explored statistical techniques for language understanding, including part-of-speech tagging, probabilistic context-free grammar induction, syntactic disambiguation through word statistics, efficient syntactic parsing, and lexical resource acquisition through statistical means.
Charniak was a founding editor of Cognitive Science; among his books are Artificial Intelligence Programming (1987) and Statistical Language Learning (1993).