同学你好,
这个点从leptokurtic的定义去理解就可以。leptokurtic=fat-tailed,肥尾等价于尾部有极端值,这一点用英文描述就是“more frequent extremely large deviations from the mean”
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从图像角度,leptokurtic(fat-tailed)分布就是下方蓝色虚线,“more frequent extremely large deviations from the mean”对应的就是两侧比绿色实线更高的尾部。也就是远离均值的地方有极端值。
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