Table 2.

Negation statistics and evaluation on the test set

(a) cTAKES Negation
	TP	TN	FP	FN	precision	recall	F-score	accuracy
Signs/symptoms	85	258	12	26	0.876	0.766	0.817	0.900
Diseases/disorders	102	709	22	21	0.823	0.829	0.826	0.950
All	187	967	34	47	0.846	0.799	0.822†	0.934†

(b) DepNeg
	TP	TN	FP	FN	precision	recall	F-score	accuracy
Signs/symptoms	85	269	1	26	0.988	0.766	0.863	0.929
Diseases/disorders	88	726	5	35	0.946	0.715	0.815	0.953
All	173	995	6	61	0.966	0.739	0.838†	0.946†

^†micro average – i.e., obtained by using a global count of each named entity and averaging these sums.