Hi, Here's a short talk I gave years ago for a user meeting on X!Tandem: www.proteomesoftware.com/XTandem_edited.pdf
Pages 11-14 discuss how the e-value is calculated. What do you mean exactly by data set/sequences? The e-value is not dependent on the number of spectra in a data set as individual spectra are not scored together (although PeptideProphet will have a harder time trying to make sense of small data sets). The e-value can be database dependent and it may not work well for a 100 sequence FASTA database if you're employing high-mass accuracy peptide selection criteria. Best, Brian On Oct 20, 3:24 am, dhirendra <[email protected]> wrote: > hi, > can anyone provide me detailed explanation about how the X!tandem e- > value is calculated and how good is it for small dataset of say 100 > sequences? --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "spctools-discuss" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/spctools-discuss?hl=en -~----------~----~----~----~------~----~------~--~---
