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Table 1 Xcorr precision refinement

From: Progressive search in tandem mass spectrometry

 

Comet

(internal)

Comet

(output)

Comet-P/Comet-E

(output)

Xcorr(1)

0.0171654

0.0172

0.0171654

Xcorr(2)

0.0324375

0.0324

0.0324375

deltaCn(1)

0.4708162

0.4708

0.4708

  1. Note that 0.4708, deltaCn(1) in the Comet (output) column, is achieved by rounding 0.4708162 (= 1 − 0.0171654/0.0324374) which is the deltanCn(1) in the Comet (internal) column. Thus, if deltaCn(1) is calculated from 0.0172 to 0.0324 which are the Xcorr values in the Comet (output) column, it becomes 0.4691 (= 1 −  0.0172/0.0324) which is different from 0.4708. Hence, the output of Xcorr values of Comet-P/Comet-E is rounded to the 7th decimal place so that deltaCn(1) is calculated by 1 − (0.0171654/0.0324374), which amount to 0.4708162 and then it is rounded to 0.4708
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BMC Bioinformatics

ISSN: 1471-2105

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