A Note on an Estimator for the Variance That Utilizes the Kurtosis

A Note on an Estimator for the Variance That Utilizes the Kurtosis
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关于利用峰度的方差估计器的注释

DOI:
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发表时间:
1990
期刊:
影响因子:
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通讯作者:
P. Intarapanich
P. Intarapanich
中科院分区:
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文献类型:
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作者:
D. Searls;P. Intarapanich

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摘要通过使用平方和的广义权重而不是1/(n-1)来最小化均方误差(MSE),开发了方差的估计量(SW 2)。找到的最佳除数是(n + 1)+(α4 − 3)(n 1 1)/n,其中α4是峰度。对于正态分布(α4 = 3),除数为n + 1。通常,对于峰度大于3,除数将大于n + 1,而对于峰度小于3,除数将小于n + 1。对于α4 > 3的分布,使用n + 1作为除数将导致较小的MSE。
Abstract An estimator (S W 2) for the variance is developed by minimizing the mean squared error (MSE) using a generalized weight for the sum of squares instead of 1/(n − 1). The optimal divisor found is (n + 1) + (α4 − 3) (n 1 1)/n, where α4 is the kurtosis. For the normal distribution (α4 = 3), the divisor becomes n + 1. Generally, for kurtosis greater than 3 the divisor will be greater than n + 1 and for kurtosis less than 3 the divisor will be less than n + 1. Using n + 1 as a divisor will result in a smaller MSE for distributions with α4 > 3.