Downloading a Package from the Web
The package you want may not be in your R installation. One of the big advantages of open source software is that people love to share. People all over the world have written their own special-purpose R packages, placing them in the CRAN repository and elsewhere.
Note
User contributions to CRAN go through a vetting process and are generally of high quality. They are, however, not tested as thoroughly as R itself.
Installing Packages Automatically
One way to install a package is to use the install_packages() function. For example, suppose you wish to use the mvtnorm package, which computes multivariate normal cumulative distribution functions and other quantities. First, choose a directory in which you wish to install ...
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