---
title: "Cheat sheets"
author: "Laurent Bergé"
date: "`r Sys.Date()`"
output:
  html_document:
    theme: journal
    highlight: haddock
    number_sections: yes
    toc: yes
    toc_depth: 3
    toc_float:
      collapsed: yes
      smooth_scroll: no
  pdf_document:
    toc: yes
    toc_depth: 3
vignette: > 
  %\VignetteIndexEntry{Cheat sheets} 
  %\VignetteEngine{knitr::rmarkdown}
  %\VignetteEncoding{UTF-8}
---

This document presents five quick reference tables: 4 are related to the specification of the formula, and one to the VCOVs. The PDF version is [here](../reference/figures/cheat-sheet.pdf).

<!-- On the location of the PDF, we need a path relative to the document. Note that by default, pkgdown imports all the contents in 'pkgroot/man/figures', which is where I placed the `cheat-sheet.pdf`. -->

## Inserting fixed-effects in a fixest estimation

![](https://github.com/lrberge/fixest/blob/master/vignettes/images/cheat-sheet/formula_fe.png?raw=true)

## Performing 2SLS/IV estimations in feols.

![](https://github.com/lrberge/fixest/blob/master/vignettes/images/cheat-sheet/formula_iv.png?raw=true)

## Estimation with multiple left-hand-sides or multiple right-hand-sides

![](https://github.com/lrberge/fixest/blob/master/vignettes/images/cheat-sheet/formula_interpolation.png?raw=true)

## Variable interpolation in fixest formulas

![](https://github.com/lrberge/fixest/blob/master/vignettes/images/cheat-sheet/formula_multiple.png?raw=true)

## How to use fixest built-in VCOVs

![](https://github.com/lrberge/fixest/blob/master/vignettes/images/cheat-sheet/vcov_builtin.png?raw=true)