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Table 8 The numbers of the models’ expectation and the correct on each held-out set. (shaded: pi-CRF)

From: Precursor-induced conditional random fields: connecting separate entities by induction for improved clinical named entity recognition

Data Model Whole instances Distanced instances
gold expected correct gold expected correct
i2b2 (clinical) 1st-order CRF 9,623 7,361 5,708 8,552 6,188 4,927
2nd-order CRF 7,785 6,046 6,547 5,245
pi-CRF 7,542 5,775 6,397 5,012
SNUH (clinical) 1st-order CRF 17,125 15,326 12,128 12,520 10,813 8,540
2nd-order CRF 15,702 12,053 11,088 8,524
pi-CRF 15,516 12,322 11,012 8,758
CoNLL (general) 1st-order CRF 5,629 3,785 2,856 4,331 2,693 2,184
2nd-order CRF 2,778 2,529 1,986 1,799
pi-CRF 1,855 1,704 1,280 1,218