埃奇沃斯级数
埃奇沃斯级数（Edgeworth series）是以爱尔兰经济学家埃奇沃斯来命名的。它和 Gram-Charlier A series 一样，是把一个随机变量的机率密度函数展成级数，级数中的每一项是用该随机变量的 cumulants 来表达。对同一个分布，Gram-Charlier A series 和埃奇沃斯级数展出来是同样的级数，只是项的排列不同。（也因此只取前几项作为逼近时的误差会有所不同）
Edgeworth series
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Edgeworth series 埃奇沃斯级数
The Gram–Charlier A series (named in honor of Jørgen Pedersen Gram and Carl Charlier), and the Edgeworth series (named in honor of Francis Ysidro Edgeworth) are series that approximate a probability distribution in terms of its cumulants. The series are the same; but, the arrangement of terms (and thus the accuracy of truncating the series) differ.
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