Table 4.
CRF Features | DS | |||||
---|---|---|---|---|---|---|
P | R | F | P | R | F | |
All | 0.856 | 0.776 | 0.814 | 0.765 | 0.682 | 0.721 |
All – lexicon | 0.852 | 0.781 | 0.815 | 0.765 | 0.646 | 0.701 |
All – POS | 0.853 | 0.776 | 0.812 | 0.754 | 0.653 | 0.700 |
All – negation | 0.854 | 0.769 | 0.810 | 0.752 | 0.646 | 0.695* |
All – context | 0.811 | 0.665 | 0.731* | 0.624 | 0.498 | 0.554* |
All – cluster | 0.851 | 0.745 | 0.794* | 0.788 | 0.549 | 0.647* |
Context + cluster | 0.860 | 0.784 | 0.821* | 0.746 | 0.628 | 0.682* |
Statistically significant changes (p < 0.05), when compared with All feature set, are marked with asterisks.
The highest values in each column are highlighted in bold.