makeWorldMap: Create a ggplot2 frame with a world map.
In dtkaplan/DCF: Distributing materials for the DCF course

Description Usage Arguments Details Value Examples

This function takes in a dataset with countries as cases. Provide the country name as a three-letter iso_a3 or any common name for the country (e.g. Canada, Fiji).

1	makeWorldMap(data, varname.x)

`data`	A dataset with countries as cases
`varname.x`	The variable name for the column that holds the countries names

It standardizes the country names and merges it another dataset which includes geographic coordinates for each country. It returns a ggplot map with no layers. It prints a message indicating how many countries will not be plotted because no latitude / longitude data was found.

A ggplot map object with no layers.

## Not run: 
somedat <- CIAdata(2001) # 2001 codes for GDP
p <- makeWorldMap(somedat,'country')
p + geom_polygon(col="blue",aes(fill=GDP))

## End(Not run)