A Novel Sample Selection Strategy for Imbalanced Data of Biomedical Event Extraction with Joint Scoring Mechanism

Table 5

The ratio of the positive and negative samples on the final training data.

	3-3	4-1	4-2	4-3	5-1	5-2	5-3	6-1	Original
Positive samples	16375
Negative samples	88054	112961	103045	97192	123122	108571	100341	123528	215383
P : N	1 : 5.377	1 : 6.898	1 : 6.292	1 : 5.935	1 : 7.519	1 : 6.630	1 : 6.128	1 : 7.544	1 : 13.153

is minimum support (minsup), is threshold , and P : N is the ratio of the positive and negative samples.