. 2007 Jul 5;8:239. doi: 10.1186/1471-2105-8-239

Table 4.

Influence of the negative:positive training set ratio on the prediction accuracy

		Neg:pos testing ratio

		1:1	1:1	100:1	100:1

		ROC50 AUC (std)^a	ROC100 AUC (std)^a	ROC50 AUC (std)^a	ROC100 AUC (std)^a
Neg:pos training ratio	1:1	0.300 (0.008)	0.385 (0.006)	0.0645 (0.0019)	0.0814 (0.0009)
	100:1	0.325 (0.004)	0.403 (0.003)	0.0747 (0.0022)	0.0944 (0.0028)

^aThe ROCn AUCs are an average of five separate experiments (each of which is itself a five-fold cross validation experiment). Their standard deviation is shown in parenthesis.