
A command to query the selected Spectrum object.
The (normalized) kurtosis of a spectrum is the fourth central moment of this spectrum, divided by the square of the second central moment, minus 3. See Spectrum: Get central moment....
The kurtosis is a measure for how much the shape of the spectrum around the centre of gravity is different from a Gaussian shape. For a white noise, the kurtosis is 6/5.
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