October 2021
Intermediate to advanced
289 pages
8h 31m
Chinese
Content preview from 数据科学中的实用统计学(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.
192
｜
第
5
章
图 5-8：比较四种方法的分类规则
在更高维度上可视化这样的预测规则非常困难，对于
GAM
和树模型，即使是为这些规则
生成区域也很不容易。
在任何情况下，对预测值的探索性分析都是有必要的。
本节要点
•
高度不平衡的数据（即我们感兴趣的结果
1
的数量很稀少）对于分类算法来说是个
问题。
•
处理不平衡数据的一种策略是，通过对冗余记录进行欠采样（或对稀有类记录进行
过采样）来平衡训练数据。
•
如果使用了所有的
1
还觉得不够，可以对稀有类进行
Bootstrap
抽样，或使用
SMOTE
算法创建与现有稀有类数据相似的合成数据。
•
非平衡数据通常表明正确分类出
1
的价值较高，而且这种价值比率应该反映在评估
指标中。
5.5.6
扩展阅读
•
《商战数据挖掘》
6
一书的作者
Tom Fawcett
写了一篇关于非平衡类的精彩文章：“
Learning
from Imbalanced Classes
”。
注
6
：
该书已由人民邮电出版社出版，详见
ituring.cn/book/1262
。——编者注
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.