Kurtosis is a measure of the peakedness of a distribution. A high kurtosis indicates a sharper peak and flatter tails, whereas a low kurtosis indicates a rounder peak and wider shoulders.
The formula for kurtosis that is unbiased and centered at 0 is


= data set
= number of data values in 
= mean of the data set

= standard deviation of the data set
The formula for kurtosis that is biased and centered at 3 is
