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ziduozhixia · 2019年12月04日

问一道题:NO.PZ2015120604000056 [ CFA I ]

问题如下图:

选项:

A.

B.

C.

解释可以帮忙翻译下选项什么意思么

2 个答案

星星_品职助教 · 2023年02月09日

@胖婷肥周

均值周围的波动代表点的离散程度,波动小即离散程度低,也就是靠均值近,图像上体现为比较瘦的峰。

星星_品职助教 · 2019年12月04日

同学你好,

这道题的意思是如果一个分布同时有较大的极端值,并且又有很小的均值周围的波动,那么这个分布的特点是什么。

较大的极端值对应着肥尾,而均值周围较小的波动对应着说明峰比较“瘦”,再结合肥尾的特点,这其实就是一个尖峰肥尾的分布。B选项的positive excess kurtosis说明(相对正态分布)有正的excess kurtosis,也就是尖峰。这个描述是正确的。C选项的描述相当于低峰。而这个分布的特点无法看出来是左偏还是右偏,所以A选项不正确。加油

胖婷肥周 · 2023年02月08日

均值周围较小的波动对应着说明峰比较“瘦 老师,尖峰肥尾这些理解,但是为什么“均值周围较小的波动对应着说明峰比较“瘦”呢?

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