Appendix B. Installing and Using Packages
One of the major strengths of R is that thousands of user-written packages are available on the Comprehensive R Archive Network (CRAN) at the R home page, http://www.r-project.org/. Package installation is easy in most cases, but there are nuances to be aware of for some of the specialty packages.
This appendix starts with some package basics and then explains how to load R packages from your hard drive and from the Web.
Package Basics
R uses packages to store groups of related pieces of software. The packages that are included with the R distribution are visible as subdirectories of your library directory ...
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