An iterative method of cluster analysis that groups large data sets into clusters of similar data. A k‑means method forms clusters around data values having the nearest mean.

A coefficient that describes the degree of concentration for a distribution of values, based on a mathematical average. The kurtosis coefficient is a value between -0.5 and 0.5. Colloquially, the Kurtosis coefficient is an average that indicates how sharp a distribution is with respect to a standard normal distribution.