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Figure 4 | Biology Direct

Figure 4

From: Calibrating E-values for MS2 database search methods

Figure 4

Average ratio of true positives to the sum of true and false positives versus E -values with cluster removal employed.

This plot displays results obtained from using the NCBI's nr database but with cluster removal procedure (see text). The black solid curve corresponds to the theoretical line given by Eq. (1). As one may see, now almost all the experimental curves are close to the theoretical curve. In particular, even ProbID is now close to the theoretical curve when compared with the right panel of Fig. 3. Again, the error bars in these plots are suppressed for clarity. They are about the size of the symbol at the low E-value end, and become larger (four to six times the symbol sizes) near large E-value end.

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