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)
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分类
｜
193
•
如果想了解更多关于
SMOTE
算法的知识，可以参考
Nitesh V. Chawla
、
Kevin W. Bowyer
、
Lawrence O. Hall
和
W
. Philip Kegelmeyer
的文章：“
SMOTE: Synthetic Minority Over-
sampling Technique
”。
•
也可以参考
Analytics V
idhya Content Team
的文章：“
Practical Guide to Deal with Imbalanced
Classification Problems in R
”。
5.6
小结
分类是预测记录属于两种（或更多）类别中哪一个的过程，它是预测性分析的一种基本工
具。一项贷款会违约吗（“是”还是“否”）？会提前偿还吗？网站访问者会点击这个链接
吗？会购买东西吗？一项保险索赔是否是诈骗？在分类问题中，我们通常只对某一个类别
感兴趣（例如欺诈性的保险索赔）。在二元分类中，通常将这种类别设置为
1
，而将另一个
更普遍的类别设置为
0
。一般来说
，分类过程的关键环节是估计一个
倾向分数
，即一条记
录属于我们感兴趣的类别的概率。一种常见的分类情形是，我们感兴趣的类别中的记录数
量非常稀少。在评估一个分类器时，除了简单的准确率之外，还有很多模型评估指标，它
们在稀有类情况下非常重要，这时候将所有记录分类为
0
可以得到很高的准确率。
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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.