在R编程语言中使用〜(波浪号) [英] Use of ~ (tilde) in R programming Language

问题描述

我在有关回归建模的教程中看到以下命令:

I saw in a tutorial about regression modeling the following command :

myFormula <- Species ~ Sepal.Length + Sepal.Width + Petal.Length + Petal.Width

此命令的作用是什么?~(波浪号)在命令中的作用是什么?

What exactly does this command do, and what is the role of ~ (tilde) in the command?

推荐答案

<-右侧的内容是.

The thing on the right of <- is a formula object. It is often used to denote a statistical model, where the thing on the left of the ~ is the response and the things on the right of the ~ are the explanatory variables. So in English you'd say something like "Species depends on Sepal Length, Sepal Width, Petal Length and Petal Width".

该行的myFormula <-部分将公式存储在名为myFormula的对象中，因此您可以在R代码的其他部分中使用它.

The myFormula <- part of that line stores the formula in an object called myFormula so you can use it in other parts of your R code.

R中公式对象的其他常见用法

lattice软件包使用它们来指定要绘制的变量.
ggplot2软件包使用它们来指定用于绘图的面板.
dplyr软件包将它们用于非标准评估.

The lattice package uses them to specify the variables to plot.
The ggplot2 package uses them to specify panels for plotting.
The dplyr package uses them for non-standard evaulation.

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