Kurtosis is the degree of
'peakedness' of a continuous
distribution. It is calculated
from the formula:
The '3' is included in the
formula to give the normal
distribution a kurtosis of
zero (some published versions do not include
it).
A distribution with a kurtosis
greater than zero is more peaky than a normal
distribution and is 'Leptokurtic'. A distribution
that is flatter than a normal distribution
is 'Platykurtic'.
