Required packages

During this chapter we will make use of the following R packages. If you don't already have them installed, you can look into Appendix, Required Packages for instructions on how do so. These packages will fall in one of two categories: packages for creating graphs and packages for working with data. Some of the packages used for interactive graphs (graphs that are not static, meaning you can move them around in your screen to see different angles of the data) will require system dependencies to work (for example, rgl and rgdal), and others will work through your web browser (for example, threejs, leaflet, and plotly). They have been tested using Google Chrome as a web browser. If you encounter any problems with your particular web browser, try using Google Chrome. The static graphics will be created using ggplot2 and some packages that extend it (for example...