# 14 Captioning and referencing equations

This section introduces how to add captions to equations, and reference them in text. Note that when using captioning, you need to use the bookdown::html_document2 output.

## 14.1 Overview

• Teaching: 5 minutes
• Exercises: 5 minutes

## 14.2 Questions

• How do I caption an equation?
• How do I reference an equation?

### 14.2.1 Numbering equations

You can provide a number for an equation by adding along with a label, provided with (\#eq:label)

$$$Y \sim X\beta_0 + X\beta_1 + \epsilon \tag{14.1}$$$

You can then refer to the equation in text using \@ref(eq:model):

Our model is given in (14.1)

If you want to provide a specific number to the equation, you can use \tag{XX.XX}

$Y \sim X\beta_0 + X\beta_1 + \epsilon \tag{1}$