If you are interested in developing R software, you probably found Chapter 19 to be interesting and useful. However, if you plan to use R simply for statistical analyses or if you need to teach (or take) a statistics course, you may want to consider the R Commander package written by John Fox. R Commander is a graphical user interface you invoke from the R command line. It is an R package itself, and must be downloaded and installed like any other R package. Once you have initiated R Commander, however, you are no longer working with the traditional R GUI, but with a different one, as you will learn here.
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