Table 3.

Prediction results of all known sigma-factor promoters of E. coli using different combination of vw Z-curve features**

Number*	Data set-3					Data set-4
	4095	650	350	280	230	4095	1100	610	360
Results (%)
	79.63	87.07	91.59	91.95	92.44	82.56	89.63	91.34	92.20
	75.98	88.17	90.49	91.46	91.83	84.51	90.12	91.10	92.80
	77.80	87.62	91.04	91.71	92.13	83.54	89.88	91.22	92.50

*Number: number of selected vw Z-curve variables

**The average accuracies of the vw Z-curve methods with 230 parameters for Data set-3 and 360 parameters for Dataset-4, which were the best ones among the algorithms evaluated here, were shown in boldface.