From Table 2, we can see that the joint model (Joint) outperforms all the presented systems in F-Score on all testing corpora.
comparing "HDP+HMM" with "HDP", the former model increases the overall F-Score from 68.7% to 75.3% (+6.6%) in PKU corpora and from 69.9% to 76.3% (+6.4%) in MSRA corpora, which proves that the character information in the HMM-based model can actually enhance the performance of the HDP-based model.