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Table 5 F1 scores of the first-order models and the pi-CRF for each corpora. The first value (‘whole instance’) is F1 score with whole test set and the second value (‘distanced instance’) is F1 score evaluated only with instances having transition dependency between NEs. (bold: best performance, shaded: pi-CRF)

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

Feature Models i2b2 2012 SNUH CoNLL 2003
   whole instance distanced instance whole instance distanced instance whole instance distanced instance
Set 1 1st-order CRF 67.22 68.24 74.75 73.20 60.68 62.19
1st-order CRF with induced labels 66.60 67.69 74.09 72.85 23.38 15.24
pi-CRF 67.29 68.43 75.50 74.43 45.54 43.41
Set 2 1st-order CRF 71.61 72.85 75.81 75.04 68.43 72.93
1st-order CRF with induced labels 70.73 71.98 75.24 74.36 44.90 41.89
pi-CRF 71.99 73.35 76.04 75.29 69.61 72.31
Set 3 1st-order CRF 72.55 73.97 76.18 75.06 82.57 83.13
1st-order CRF with induced labels 71.25 72.75 75.37 74.18 80.81 81.55
pi-CRF 72.58 74.04 76.24 75.33 82.08 82.76