This is a printed edition of the reference documentation for R (version 2.13.x), a powerful free environment for statistical computing and graphics. This is the fourth volume which covers the methods, tools and utilities packages. There are four volumes in the complete set of manuals. All the manuals are written by the developers of R, and represent the definitive guide to the software. The manuals explain the use of each command in detail, with references, implementation notes and examples. Every volume includes a comprehensive index of entries listed by keyword and topic. For each volume sold 1 USD is donated by the publisher (Network Theory Ltd) to the R Foundation to support the development of the software.