kurtosis noun. [kǝ:'tǝʊsɪs] E20.
[Greek kurtōsis a bulging, convexity, from kurtos bulging, convex: see -OSIS.]
Statistics. The degree of sharpness of the peak of a frequency-distribution curve, spec. as measured by the quantity μ₄/μ₂² or its excess over 3 (μ₄ and μ₂ being the fourth and the second moments about the mean of the distribution).

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