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Topics - akale

1
XCMS Online / Feature score
Hello,

The XCMS online results table contains a column named "feature score" which is the COMBSUM of the p-value and maxint. Could you explain what this means? How is it calculated?

Thanks,
Andrew
2
XCMS Online / calculating p-values
Hello,

I am trying to go through the output in Excel and adjust for features in which one or more of the spectra had a zero for an ion count. After removing these points, I can recalculate the tstat using Welch's t-test but this should alter the p-value. Could somebody tell me how the p-values are computed from the tstat?

Thanks,
Andrew