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）
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266
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第
10
章
Petal.Length
Petal.Width
2.5
2.0
1.5
1.0
0.5
0.0
4 62
virginicasetosa
Species
versicolor
图 10-18：在底部添加图例
Petal.Length
Petal.Width
2.5
2.0
1.5
1.0
0.5
0.0
4 62
virginica
setosa
Species
versicolor
图 10-19：在图中某一处添加图例
除了图例之外的许多方面，ggplot 使用明智的默认值，但提供了覆盖它们和调整细
节的灵活性。你可以通过键入
?theme
或查看 ggplot 在线参考资料（
http://ggplot2.
tidyverse.org/reference/theme.html
），找到与图例相关的 ggplot 选项的更多详细信息。
10.7 绘制散点图的回归线
10.7.1 问题
绘制数据点对，同时需要添加一条说明它们线性回归关系的线。
图形
｜
267
10.7.2 解决方案
使用 ggplot，并且无须首先使用 R 中的 lm 函数计算线性模型。我们可以使用 geom_
smooth 函数来调用 ggplot 函数内部的线性回归模型。
如果我们的数据在数据框中，并且
x
和
y
数据在列 x 和列 y 中，我们绘制回归线如下：
ggplot(df, ...
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