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Table 4 Official scores for the CEM subtask in the BioCreative IV CHEMDNER competition.

From: A CRF-based system for recognizing chemical entity mentions (CEMs) in biomedical literature

  Run 1 Run 2 Run 3 Run 4 Run 5
cost 2−2 2−1 20 2 2-
TP 15,821 16,531 16,991 17,328 17,512
FP 1,834 2,007 2,009 2,129 2,211
FN 9,530 8,820 8,360 8,023 7,839
Precision(%) 89.61 89.17 89.43 89.06 88.79
Recall(%) 62.41 65.21 67.02 68.35 69.08
F1 score(%) 73.58 75.33 76.62 77.34 77.70
ABBREVIATION 53.90 55.75 56.74 57.63 58.24
FAMILY 59.50 62.20 64.80 66.23 67.28
FORMULA 72.76 74.30 74.88 75.46 75.84
IDENTIFIER 68.62 70.18 69.98 69.79 69.59
MULTIPLE 27.64 32.16 28.64 31.66 31.66
SYSTEMATIC 69.57 72.61 74.32 75.61 76.35
TRIVIAL 58.95 62.73 65.48 67.41 68.26
NO CLASS 51.22 51.22 56.10 58.54 58.54