## AMCP: An R Package for the Book’s Data

All of the data sets are available via the AMCP package, which is available from the Comprehensive R Archival Network (CRAN). The AMCP package requires R, which can itself be downloaded from CRAN.

First, the AMCP package has been installed (which only needs to happen once) on your R system (unless a new version of R is installed). The package can be installed using the following command, where R> represents the R command prompt and R code is in blue typewriter font.

`R> install.packages("AMCP")`

Second, the package needs to be loaded (each new R session):

`R> library("AMCP")`

Third, to load a particular data set, one needs to use the data() function as

`R> data("chapter_x_table_y)" `

which then puts table *y* from chapter *x* into the workspace. The ls() function will show all of the objects in the workspace:

`R> ls()`

For example, consider Table 7 from Chapter 9, which is loaded into the workspace as:

`R> data("chapter_9_table_7") `

(Note the quotes above). One could then work with the data. For example, to quickly summarize the data, the summary() function can be used (note without quotes) as

```
R> summary(chapter_9_table_7)
```

Note that all AMCP data sets can be listed using the data() function as

```
R> data(package="AMCP")
```

`Without including package="AMCP" all data sets from all installed packages will be listed.`

` `