Transfer posterior error probability estimation for peptide identification

BMC Bioinformatics

Table 1 The PEP estimation errors of three methods on the simulated data

	Method	Ratio=1%		Ratio=5%		Ratio=10%		Ratio=20%		Ratio=100%
		Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD
n=1	Combined	71.88	4.53	33.75	3.08	19.75	1.89	10.71	1.02	2.27	0.20
	Separate	7.02	5.67	1.81	1.46	0.98	0.80	0.52	0.43	0.11	0.09
	Transfer	4.33	4.14	1.21	1.14	0.68	0.64	0.37	0.35	0.08	0.08
n=10	Combined	56.71	3.54	31.91	2.75	18.93	1.76	10.31	0.96	2.19	0.19
	Separate	4.86	4.20	1.38	1.20	0.76	0.66	0.41	0.36	0.09	0.08
	Transfer	2.78	2.70	0.89	0.90	0.51	0.52	0.28	0.29	0.06	0.06
n=20	Combined	41.11	3.75	29.73	2.59	18.00	1.74	9.87	0.98	2.11	0.19
	Separate	3.78	3.41	1.24	1.13	0.70	0.65	0.38	0.36	0.08	0.08
	Transfer	2.00	1.88	0.76	0.81	0.46	0.49	0.26	0.28	0.06	0.06
n=50	Combined	8.41	3.62	25.67	2.14	16.36	1.53	9.10	0.86	1.95	0.17
	Separate	2.04	1.51	1.02	0.90	0.59	0.54	0.33	0.31	0.07	0.07
	Transfer	1.01	0.81	0.66	0.70	0.41	0.44	0.23	0.26	0.05	0.06
n=100	Combined	0.03	0.05	19.10	1.68	13.77	1.36	7.87	0.78	1.70	0.15
	Separate	0.13	0.23	0.80	0.66	0.47	0.41	0.26	0.23	0.06	0.05
	Transfer	0.05	0.07	0.49	0.50	0.32	0.35	0.19	0.21	0.04	0.05

Notes: Mean and SD, the mean and standard deviation of mean squared errors (MSEs) of estimates; n, the number of correct scores in group G; Ratio, the percentage of top scores whose MSEs were evaluated

ISSN: 1471-2105