Table 2 Performance of SSVMs and CRFs based NER systems when different features and tag representations were used.
Tags | Features | SSVMs - F(R/P)(%) | CRFs - F(R/P)(%) |
|---|---|---|---|
BIO | Base | 84.89(83.39/86.44) | 84.62 (82.35/87.01) |
| Â | Base + Clustering | 85.22(84.05/86.43) | 85.16 (82.94/87.50) |
| Â | Base + Distributional | 85.19(84.00/86.42) | 85.12(82.80/87.58) |
| Â | Base + Clustering + Distributional | 85.45(84.30/86.63) | 85.31(83.19/87.54) |
BIESO | Base | 85.42(83.60/87.31) | 85.04(82.31/87.97) |
| Â | Base + Clustering | 85.74(84.15/87.40) | 85.59(83.16/88.16) |
| Â | Base + Distributional | 85.74(84.16/87.38) | 85.35(82.82/88.05) |
| Â | Base + Clustering + Distributional | 85.82(84.31/87.38) | 85.68(83.30/88.20) |