A stratification method based on clustering for the minimization of data masking effect in signal detection

Table 2 Signal detection results of stratification and non-stratification

	Positive	Negative
	Stratification (Non-stratification)	Stratification (Non-stratification)
Known	5046 (3739)	7447 (8754)
Unknown	5290 (3114)	19,410 (21,586)

ISSN: 1472-6947