1. A method in a computer system for selecting a language model, the method comprising: operating the computer system to perform steps of: collecting a plurality of language models; collecting a set of corrected dictated reports; comparing the corrected dictated reports with the plurality of language models; determining a perplexity factor for each of the plurality of language models based on the comparison with the corrected dictated reports; and selecting the one of the plurality of language models having the lowest perplexity factor.