Calculation Of Kurtosis. If the curve of a distribution is more outlier prone or heavier-tailed than a normal or mesokurtic curve then it is referred to as a Leptokurtic curve. The coefficient of kurtosis for normal distribution is 3 therefore excess kurtosis equals coefficient of kurtosis less 3.
Librarymoments calculate skewness skewness data -1391777 calculate kurtosis kurtosis data 4177865 The skewness turns out to be -1391777 and the kurtosis turns out to be 4177865. As kurtosis is calculated relative to the normal distribution which has a kurtosis value of 3 it is often easier to analyse in terms of excess kurtosis. The Excel functions SKEW and KURT calculate skewness and kurtosis for a dataset.
Skewness and kurtosis in MS Excel.
If the curve of a distribution is more outlier prone or heavier-tailed than a normal or mesokurtic curve then it is referred to as a Leptokurtic curve. Why do we care. As kurtosis is calculated relative to the normal distribution which has a kurtosis value of 3 it is often easier to analyse in terms of excess kurtosis. As the name suggests it is the kurtosis value in excess of the kurtosis value of the normal distribution.
