Keywords: dejean02a

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#### Evaluation:

Table 3 shows the result for several values of the principal parameters. The baseline, (assign an element its most frequent category: O, I-NP or B-NP) provides an F1-score of 80.13. These results were obtained without using lexicalized information (W feature in the example Figure 1).

Table 3: Influence of some parameters.
| 0.9 | 0.85 | 0.80 | 0.75 | 0.75 | 0.5 | 0.5 |
length of the context | 2 | 2 | 2 | 2 | 1 | 2 | 1 |
nb rules | 1144 | 930 | 884 | 811 | 361 | 1122 | 592 |
nb exceptions | 192 | 230 | 287 | 297 | 134 | 669 | 357 |
F w/o excep | 88.79 | 90.19 | 89.12 | 89.28 | 88.08 | 88.21 | 87.61 |
F with excep | 88.93 | 90.31 | 90.47 | 90.62 | 89.26 | 90.70 | 90.07 |

Next: The effect of refinement: Up: First Experiment Previous: Presentation of the task