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Rappsilber-Laboratory / build-xiview

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Filter peptide matches on Mascot expect value instead of Mascot score (public website) #87

Open vrkosk opened 2 years ago

vrkosk commented 2 years ago

The next release of Mascot has mzIdentML 1.2 exporting for crosslinked search results. Each match has a score and expect value:

            <cvParam accession="MS:1001171" name="Mascot:score" cvRef="PSI-MS" value="59.10" />
            <cvParam accession="MS:1001172" name="Mascot:expectation value" cvRef="PSI-MS" value="0.00038" />

The scores are shown correctly in xivIEW. You can filter on the score, but not on the expect value. Often the expect value is the more relevant metric.

You can also export a CSV file from Mascot in xiVIEW format. If you replace scores in the Score column with expect values, these are shown in xiVIEW, but the filtering has the opposite orientation; low expect value = good, high = bad, whereas high score = good, low = bad.