Kurtosis as Peakedness, 1905 - 2014. R.I.P.
Kurtosis as Peakedness, 1905 - 2014. R.I.P.
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DOI:
10.1080/00031305.2014.917055
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
Westfall PH
中科院分区:
文献类型:
--
作者:
Westfall PH
The incorrect notion that kurtosis somehow measures “peakedness” (flatness, pointiness or modality) of a distribution is remarkably persistent, despite attempts by statisticians to set the record straight. This article puts the notion to rest once and for all. Kurtosis tells you virtually nothing about the shape of the peak - its only unambiguous interpretation is in terms of tail extremity; i.e., either existing outliers (for the sample kurtosis) or propensity to produce outliers (for the kurtosis of a probability distribution). To clarify this point, relevant literature is reviewed, counterexample distributions are given, and it is shown that the proportion of the kurtosis that is determined by the central μ ± σ range is usually quite small.
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