Topic: s/n ratio

How does mMass calculate signal-to-noise ratio of a peak?


Re: s/n ratio


BASELINE: is calculated as a median of the points within specified window.
NOISE (noise width): is calculated as a 2 * median of absolute deviations (according to baseline) of the points within specified window.
SIGNAL: is calculated as the measured intensity minus baseline level.

To conclude, s/n strongly depends on your baseline settings.


Re: s/n ratio

Thanks Martin.
Definitely mMass is easiest way to calculate s/n ratio. But sometime i found s/n overestimated or under estimated using mMass. I used to calculate s/n ratio manually. Where signal(minus absolute noise) is divided by absolute noise in specified window (apprx 1Da).