Table 1.

Testing results for five sigma classes of E. coli and cyanobacteria¹

σ class	TP	FN	TN	FP	Sn, %	Sp, %	P1, %	P2, %	F1, %
σ70	180	20	377	23	90.0	93.3	94.0	90.4	92
σ38	37	3	75	5	92.5	93.8	93.7	92.6	93.1
σ32	46	4	95	5	92.0	95.0	94.9	92.2	93.4
σ28	31	4	69	1	88.6	98.6	98.4	89.6	93.2
σ24	86	14	193	7	86.0	96.5	96.1	87.3	90.7
σA	921	79	1921	79	92.1	96.1	95.9	92.4	94
σC	36	14	96	4	72	96	94.7	75.0	81.8
σF	80	20	193	7	80.0	96.5	95.8	82.8	87.2
σG	72	28	188	12	72.0	94.0	92.3	77.1	80.9
σH	38	12	92	8	76	92	90.5	74.2	82.6

¹Test experiments for every sigma class were repeated 10 times for randomly selected negative sets and the means were taken.