Conventions

In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

Any command-line input or output is written as follows:

data <- read.delim("local-data.txt", header=TRUE, sep="\t")
data <- read.table("local-data.txt", header=TRUE, sep="\t")

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "Clicking the Next button moves you to the next screen."

Note

Warnings or important notes appear in a box like this.