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Table 2 Annotation statistics

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

a) i2b2 2012
Set Problem Test Treatment
Train 4,962 2,558 3,719
Test 4,270 2,140 3,213
b) SNUH
Set Symptom Test Disease Medication Procedure
Train 3,923 4,559 5,084 3,642 1,175
Test 3,737 3,917 4,828 3,496 1,147
c) CoNLL 2003
Set Location Person Organization Miscellaneous
Train 7,140 6,600 6,321 3,438
Test 1,656 1,617 1,662 694