April 2014
Beginner to intermediate
830 pages
15h 21m
Chinese
Content preview from Mathematica 錦囊妙計
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468
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第十二章
使用
Kurtosis
指令計算分布的
峰度
，高峰度代表資料分布的頂峰較細尖且資料尾部較
粗長，低峰度則相反。
[Page-470]
ch12.indd 468 2014/4/2 下午 01:57:41
12.7 搜尋並調整離群值（Outliers）
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469
討論說明
CentralMoment
指令計算分布的
中央動差
，中央動差是很基本的統計測度量。其定義為：
第二階中央動差稱為
母體變異數
（相較於變異數較少使用）。[Page-471]
偏度
Skewness
指 令 等 同 於
CentralMoment[list,3]/CentralMoment[list,2]^(3/2)
； 而
峰度
Kurtosis
指令等同於
CentralMoment[list,4]/CentralMoment[list,2]^2
。
12.7 搜尋並調整離群值（Outliers）
問題點
你希望找出資料中的離群值，並調整統計資料。
解決方案
找出離群值有一個簡單且直接的方式，就是使用
Sort
指令進行排序，並檢查輸出串列
的起始端與結束端的串列元素。此外，你也可以使用
Nearest
指令取出最接近極大值或
極小值的幾個元素。
ch12.indd 469 2014/4/2 下午 01:57:41
470
|
第十二章
另一個方法是使用
TrimmedMean ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.