The word kurtosis sounds like a painful, festering disease of the gums. But the term actually describes the shape of a data distribution.
Frequently, you'll see kurtosis defined as how sharply "peaked" the data are. The three main types of kurtosis are shown below.
Lepto means "thin" or "slender" in Greek. In leptokurtosis, the kurtosis value is high.
Platy means "broad" or "flat"—as in duck-billed platypus. In platykurtosis, the kurtosis value is low.
Meso means "middle" or "between." The normal distribution is mesokurtic.
Mesokurtosis can be defined with a value of 0 (called its "excess"...