Example R programs and commands
		 25. How to install a contributed R package:

1. Become superuser (Administrator on a Windows machine;
   nothing special on a Macintosh).
2. Start R and type

     install.packages("snpar")

3. Select a CRAN mirror site from which to download, from the
   "CRAN Mirror" panel that appears. USA (MO) is the closest. 
4. Wait for R to finish installing the package.

You will then have the functions in the snpar package, including
runs.test(), installed on your machine in the right place for R to find them.
You will also have any packages that "snpar" depends on.  All these
functions are available even for non-superuser, even for later R sessions.

However, the newly installed contributed functions in package "snpar" are
not loaded by default at R's startup.  Load them with

  require(snpar)

Then runs.test() and help(runs.test) should work as for any other R function.

Loading other contributed R functions is done the same way.  Find out which
package they are in (use a search engine) then download and install that
package just as you installed "snpar" above.