The Kurtosis of a distribution measures the thickness of the tails of a distribution (see skewness). Kurtosis is a measure of flatness and tail thickness of a distribution as compared with the normal distribution. Positive kurtosis, or leptokurtic, indicates a relatively peaked distribution. Negative kurtosis, or platykurtic, indicates a relatively flat distribution. for a normal distribution, kurtosis is equal to 3. When the tail of the distribution is thicker than the normal distribution, kurtosis will be greater than 3. When the tail of the distribution is thinner than the normal distribution, the kurtosis will be less than 3.

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