June 2020
Beginner to intermediate
522 pages
9h 6m
Chinese
Content preview from R 语言经典实例（原书第 2 版）
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.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.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.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.
线性回归和方差分析
｜
355
95% family-wise confidence level
Thu-Fri
Wed-Fri
Tue-Mon
Tue-Thu
Wed-Tue
-
0.004 0.004
-
0.002 0.002
Differences in mean levels of wday
图 11-9：
TukeyHSD
绘图
11.23.4 另请参阅
参见 11.21 节。
11.24 执行稳健方差分析 (Kruskal-Wallis 检验 )
11.24.1 问题
将数据分为几组。各组数据不是正态分布的，但它们的分布具有相似的形状。你需要执
行一个类似方差分析的检验
—
你想知道这些组的中位数是否显著不同。
11.24.2 解决方案
创建一个定义数据组的因子。使用 kruskal.test 函数，该函数实现 Kruskal-Wallis 检
验。与方差分析检验不同，此检验不依赖于数据的正态性：
kruskal.test(x ~ f)
这里，x 是数据向量，f 是分组因子。输出结果包括
p
值。通常，
p
< 0.05 表示两组或更
多组的中位数之间存在显著差异，而
p
> 0.05 没有提供这样的证据。
356
｜
第
11
章
11.24.3 讨论
通常，方差分析假设数据是正态分布的。它可以允许数据些许偏离正态，但极端偏差会
产生无意义的 ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.