Which performs better for new word detection, character based or Chinese Word Segmentation based?

This paper proposed a novel method to evaluate the performance of New Word Detection (NWD) based on repeats extraction. For small-scale corpus, we put forward employing Conditional Random Field (CRF) as statistical framework to estimate the effects of different strategies of NWD. For the situations of large-scale corpus, as there is no infinity of annotated corpus, comparative experiments are unable to carry out evaluation. Accordingly, this paper proposed a pragmatic quantitative model to analyze and estimate the performance of NWD for all kinds of cases, especially for large-scale corpus situation. Studies have shown there is a good mutual authentication between experimental results and conclusion from the quantitative model. On the basis of analysis for experimental data and quantitative model, a reliable conclusion for effects of Chinese NWD basing the two strategies is reached, which can give a certain instruction for follow-up studies in Chinese new word detection.