Is it possible there are no correct results in that set? Common pitfalls are incorrect search parameters (e.g. wrong mods enabled or disabled) and wrong database. If you have decoys in your database these can be utilized for a more accurate mixture model generation using options "DECOY=<your decoy prefix> DECOYPROBS NONPARAM" in additions to the options you already have enabled.
-David On Mon, Oct 3, 2016 at 10:39 AM, Ali <sma.banijam...@gmail.com> wrote: > Hi > > I am using PeptideProphet on my X!Tandem search results. There are ~150 > experiments and PeptideProphet works fine on most of them but for ~50 > experiments, PeptideProphet returns zero probability for all of the > peptides. Can some one please tell me what might be the issue? > > *More Info:* > I am using TPP v4.8 on Linux. PeptideProphet does not show an error when > it produces zero probability for all of the search results. > This is what I'm doing: > -search with X!Tandem > -Tandem2XML ./100.tandem.xml ./100.tandem.pep.xml > -InteractParser ./100.interact.xml ./100.tandem.pep.xml -S -Etrypsin > -PeptideProphetParser ./100.interact.xml ACCMASS PPM NOICAT MINPROB=0 > > > Thank you very much, > *Ali* > > -- > 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 spctools-discuss+unsubscr...@googlegroups.com. > To post to this group, send email to spctools-discuss@googlegroups.com. > Visit this group at https://groups.google.com/group/spctools-discuss. > For more options, visit https://groups.google.com/d/optout. > -- 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 spctools-discuss+unsubscr...@googlegroups.com. To post to this group, send email to spctools-discuss@googlegroups.com. Visit this group at https://groups.google.com/group/spctools-discuss. For more options, visit https://groups.google.com/d/optout.
