---
title: "Maddison Project Database"
author: "Eric Persson"
date: "`r Sys.Date()`"
output: rmarkdown::html_vignette
vignette: >
  %\VignetteIndexEntry{Maddison Project Database}
  %\VignetteEngine{knitr::rmarkdown}
  %\VignetteEncoding{UTF-8}
---

## Introduction

This package contains the [Maddison Project Database](http://www.ggdc.net/maddison/), which contains estimates of GDP per capita for all countries in the world between AD 1 and 2016, in a format amenable to analysis in R.

The database was last updated in 2018.

As per instructions on the Maddison Project website, please site the data as follows:

> __Attribution requirement__ - When using these data (for whatever purpose), please make the following reference:
> - Maddison Project Database, version 2018. Bolt, Jutta, Robert Inklaar, Herman de Jong and Jan Luiten van Zanden (2018), “Rebasing ‘Maddison’: new income comparisons and the shape of long-run economic development”, [Maddison Project Working paper 10](https://www.rug.nl/ggdc/historicaldevelopment/maddison/research)
> - For the references to the original research on individual countries, see Appendix A of Bolt et al. (2018).

## Example use

```{r, warning = FALSE, message = FALSE}
library(maddison)
library(ggplot2)

str(maddison)
head(maddison)
```

```{r, fig.width = 6, fig.height = 4, warning = FALSE, message = FALSE}
df <- subset(maddison, 
             year >= 1800 &
             iso2c %in% c("DE", "FR", "IT", "UK", "US"))

ggplot(df, aes(x = year, y = rgdpnapc, color = country)) +
  geom_line() +
  scale_y_log10() +
  theme_bw() +
  labs(x = NULL, y = "GDP per capita (2011 U.S. dollars)\n", color = NULL,
       title = "GDP per capita (1800-2010)")
```

## Disclaimer

This package is not affiliated with, nor endorsed by, the Maddison Project. I aim to update it whenever the database is updated. If you ever see that it is out-of-date, don't hesitate to send a pull request and/or remind me to update it.