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

Table 4

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

	3-3	4-1	4-2	4-3	5-1	5-2	5-3	6-1	Original
Positive samples	11419
Negative samples	60742	77829	70901	66809	84910	74851	69180	85247	150308
P : N	1 : 5.319	1 : 6.816	1 : 6.209	1 : 5.851	1 : 7.436	1 : 6.555	1 : 6.058	1 : 7.465	1 : 13.163

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