# Peaks standard deviation

This result calculates the standard deviation from the intensity of the
identified peaks.

where *N* is the number of identified peaks, and is the intensity
of peak *i*.

## Parameters

This operation takes one parameter to select how many peaks to consider in
the standard deviation calculation.
This allows to only calculate the standard deviation on the most intense peaks.
For instance if the maximum number of peaks is 3, the standard deviation will
be calculated using the intensity of the 3 most intense peaks.
If the value of the maximum number of peaks is set to -1, all the identified
peaks are considered.