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Calculates how flat or peaked the data-set is distributed.
n = n
>0 the higher the Kurtosis value is the more pointier the curve is.
=0 is normal.
<0 the lower the flatter the curve is.
What can cause flat or peaked data
The data set is only a part of all the data and all the data outside the tolerance borders is filtered.
Mix of more distributions
With a small sample size the Kurtosis value can not be trusted
How statistically deal with flat or peaked data
See What to do with not normally distributed data