偏度和峰度
https://www.bilibili.com/video/BV1Hq4y1h7HA?spm_id_from=333.337.search-card.all.click&vd_source=bdbb5be671dc7bcfadbe64bf3d0d2f95
https://www.bilibili.com/video/BV11i4y1Z7Js?spm_id_from=333.337.search-card.all.click&vd_source=bdbb5be671dc7bcfadbe64bf3d0d2f95


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