No it is not correct for xl peptides. There are two peptides in every match thus id you assume the database contains half decoys and half targets, then there are 3/4 chance to match a decoy peptide randomly and only 1/4 chance to match a target. So the random xl matches will be 3/4 decoy and 1/4 target so your decoy based error rate should estimate the number of wrong hits by taking the number of decoy matches and multiplying by 4/3. So wrong = decoy*4/3 and errorrate = wrong/total.
Hopefully this makes sense. David -- You received this message because you are subscribed to the Google Groups "spctools-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/spctools-discuss/CAGJJY%3D8KS1QTe6eyLsyR-_btC3JhWOZPnT-LKiu8ziY38WyJHQ%40mail.gmail.com.
