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.
回归与预测
｜
139
多重共线性
如果预测变量之间完全相关，或者接近完全相关，回归就会变得不稳定或者难以计算。
同义词
共线性
混淆变量
一种重要的预测变量，如果忽略了这种变量，会导致回归方程中的虚假关系。
主效应
预测变量与结果变量之间的关系，与其他变量无关。
交互作用
两个或更多预测变量与响应变量之间相互依赖的关系。
4.5.1
相关的预测变量
在多元回归中，预测变量彼此之间经常是相关的。以
4.2.4
节中拟合的模型
step_lm
为例，
研究一下它的回归系数。
R
代码：
step_lm$coefficients
(Intercept) SqFtTotLiving Bathrooms
6.178645e+06 1.992776e+02 4.239616e+04
Bedrooms BldgGrade PropertyTypeSingle Family
-5.194738e+04 1.371596e+05 2.291206e+04
PropertyTypeTownhouse SqFtFinBasement YrBuilt
8.447916e+04 7.046975e+00 -3.565425e+03
Python
代码：
print(f'Intercept: {best_model.intercept_:.3f}')
print('Coefficients:')
for name, coef in zip(best_variables, best_model.coef_):
print(f' {name}: {coef}') ...
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.