# World Bank data in `R`

The `WDI` package allows users to search and download data from over 40 datasets hosted by the World Bank, including the World Development Indicators ('WDI'), International Debt Statistics, Doing Business, Human Capital Index, and Sub-national Poverty indicators.

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# Installation

`WDI` is published on CRAN and so can be installed by simply typing this in the `R` console: 

```r
install.packages('WDI')
```

To install the development version of the package, use `remotes`:

```r
library(remotes)
install_github('vincentarelbundock/WDI')
```

# Searching for data

You can search for data by using keywords in `WDIsearch`. For instance, if you are looking for data on Gross Domestic Product: 

```r
WDIsearch('gdp')
```

Which produces this: 

```r
> WDIsearch('gdp')[1:10,]
      indicator              name                                                                      
 [1,] "BG.GSR.NFSV.GD.ZS"    "Trade in services (% of GDP)"                                            
 [2,] "BM.KLT.DINV.GD.ZS"    "Foreign direct investment, net outflows (% of GDP)"                      
 [3,] "BN.CAB.XOKA.GD.ZS"    "Current account balance (% of GDP)"                                      
 [4,] "BN.CUR.GDPM.ZS"       "Current account balance excluding net official capital grants (% of GDP)"
 [5,] "BN.GSR.FCTY.CD.ZS"    "Net income (% of GDP)"                                                   
 [6,] "BN.KLT.DINV.CD.ZS"    "Foreign direct investment (% of GDP)"                                    
 [7,] "BN.KLT.PRVT.GD.ZS"    "Private capital flows, total (% of GDP)"                                 
 [8,] "BN.TRF.CURR.CD.ZS"    "Net current transfers (% of GDP)"                                        
 [9,] "BNCABFUNDCD_"         "Current Account Balance, %GDP"                                           
[10,] "BX.KLT.DINV.WD.GD.ZS" "Foreign direct investment, net inflows (% of GDP)" 
```

`WDIsearch` uses grep and ignores cases, so you can also use regular expressions. For instance, if you are looking for GDP per capita in constant dollars: 

```r
WDIsearch('gdp.*capita.*constant')
     indicator           name                                                 
[1,] "GDPPCKD"           "GDP per Capita, constant US$, millions"             
[2,] "NY.GDP.PCAP.KD"    "GDP per capita (constant 2000 US$)"                 
[3,] "NY.GDP.PCAP.KN"    "GDP per capita (constant LCU)"                      
[4,] "NY.GDP.PCAP.PP.KD" "GDP per capita, PPP (constant 2005 international $)"
```

# Download and use the data

Download a series you like for the countries you like:

```r
dat = WDI(indicator='NY.GDP.PCAP.KD', country=c('MX','CA','US'), start=1960, end=2012)
```

Look at the data: 

```r
head(dat)
  iso2c country NY.GDP.PCAP.KD year
1    CA  Canada       9374.883 1960
2    CA  Canada       9479.824 1961
3    CA  Canada       9967.366 1962
4    CA  Canada      10290.362 1963
5    CA  Canada      10774.653 1964
6    CA  Canada      11283.606 1965
```

Plot the data:

```r
library(ggplot2)
ggplot(dat, aes(year, NY.GDP.PCAP.KD, color=country)) + geom_line() + 
    xlab('Year') + ylab('GDP per capita')
```

![GDP per capita in North America](https://raw.githubusercontent.com/vincentarelbundock/WDI/main/web/gdp_per_capita.jpg)

Note: You can use `country='all'` to download data for all available countries. You can also feed a vector of indicator strings if you want to download multiple indicators at once.

# Monthly or quarterly data

Some World Bank series are available at the monthly or quarterly frequency. You can download those simply using the `start` and `end` arguments:

```r
WDI(indicator = 'DPANUSSPB', country = 'CHN', start = '2012M01', end = '2012M05')

  iso2c country DPANUSSPB    year
1   CHN   China  6.324130 2012M05
2   CHN   China  6.303810 2012M04
3   CHN   China  6.313545 2012M03
4   CHN   China  6.300286 2012M02
5   CHN   China  6.313091 2012M01
```

# Automatic rename

If the vector that you supply to ``WDI`` is named, the function will automatically rename columns where possible.

```r
dat <- WDI(indicator = c("gdp_per_capita" = "NY.GDP.PCAP.KD",
                         "population" = "SP.POP.TOTL"))
head(dat)
iso2c    country year gdp_per_capita population
1    1A Arab World 2005       5378.379  316264728
2    1A Arab World 2006       5594.899  323773264
3    1A Arab World 2007       5711.663  331653797
4    1A Arab World 2008       5898.516  339825483
5    1A Arab World 2009       5782.422  348145094
6    1A Arab World 2010       5916.330  356508908
```

# Updating series list

To speed up search, `WDI` ships with a local list of all available WDI series. This list will be updated semi-regularly, but you may still want to update it manually to get access to the very latest data series. To do so, use the `cache` function:

```r
new_cache = WDIcache()
WDIsearch('gdp', cache=new_cache)
```

# Bugs, suggestions, etc.

Thanks for using `WDI`! Please send all bug reports and suggestions through the github issue tracker or by email to vincent.arel-bundock@umontreal.ca
