A New Yardstick and Tool for Personalized Vocabulary Building.

The goal of this research is to increase the value of each individual student's vocabulary by finding words that the student doesn't know, needs to, and is ready to learn. To help identify such words, a better model of how well any given word is expected to be known was created. This is accomplished by using a semantic language model, LSA, to track how every word changes with the addition of more and more text from an appropriate corpus. We define the "maturity" of a word as the degree to which it has become similar to that after training on the entire corpus. An individual student's average vocabulary level can then be placed on the word-maturity scale by an adaptive test. Finally, the words that the student did or did not know on the test can be used to predict what other words the same student knows by using multiple maturity models trained on random samples of typical educational readings. This detailed information can be used to generate highly customized vocabulary teaching and testing exercises, such as Cloze tests.