Table 5.
The effect analysis of each feature/strategy
| Corpus | Feature/strategy | P | R | F-score | Δ |
|---|---|---|---|---|---|
| NCBI | None | 85.08 | 85.26 | 85.17 | – |
| Character-level | 84.50 | 84.41 | 84.46 | 0.71 | |
| Lexicon | 83.53 | 83.35 | 83.44 | 1.73 | |
| MLS | 83.97 | 84.41 | 84.19 | 0.98 | |
| Post-processing | 84.84 | 84.84 | 84.84 | 0.33 | |
| CDR | None | 88.20 | 87.46 | 87.83 | – |
| Character-level | 87.25 | 87.35 | 87.30 | 0.53 | |
| Lexicon | 85.48 | 84.90 | 85.19 | 2.64 | |
| MLS | 87.18 | 86.17 | 86.67 | 1.16 | |
| Post-processing | 86.67 | 86.69 | 86.68 | 1.15 |
Notes. Δdenotes the corresponding F-score decrease when a strategy or a feature is removed