Skip to main content

Table 2 Actual FPRs and the corresponding estimated FPRs

From: A nonparametric model for quality control of database search results in shotgun proteomics

Instrument type

Charge state

Expected FPR = 0.05

Expected FPR = 0.01

  

Total matches/false positive matches

Actual FPR

Estimated FPR

Total matches/false positive matches

Actual FPR

Estimated FPR

LCQ

+1

62/3

0.048

0.030

57/2

0.035

0.000

 

+2

521/23

0.044

0.049

464/6

0.012

0.009

 

+3

181/2

0.011

0.043

178/2

0.011

0.000

LTQ

+1

447/43

0.096

0.048

242/9

0.037

0.008

 

+2

4,623/169

0.037

0.050

3,961/26

0.007

0.010

 

+3

1,611/59

0.037

0.050

1,449/26

0.018

0.010

LTQ/FT

+1

168/18

0.107

0.047

124/12

0.097

0.000

 

+2

1,861/43

0.023

0.049

1,543/14

0.009

0.009

 

+3

565/6

0.011

0.048

543/7

0.007

0.007