Proceedings of the joint workshop on NLP for Computer Assisted Language Learning and NLP for Language Acquisition

This paper presents work on how we can link word lists derived from learner corpora to target proficiency levels for lexical complexity analysis. The word lists present frequency distributions over different proficiency levels. We present a mapping approach which takes these distributions and maps each word to a single proficiency level. We are also investigating how we can evaluate the mapping from distribution to proficiency level. We show that the distributional profile of words from the essays, informed with the essays’ levels, consistently overlaps with our frequency-based method, in the sense that words holding the same level of proficiency as predicted by our mapping tend to cluster together in a semantic space. In the absence of a gold standard, this information can be useful to see how often a word is associated with the same level in two different models. Also, in this case we have a similarity measure that can show which words are more central to a given level and which words are more peripheral.