October 2015
Beginner to intermediate
250 pages
6h 26m
English
One of the simplest yet still quite useful graphs is the strip chart (called a “dot plot” by some analysts). This graph provides a way to view how a set of numbers is distributed. That is to say, what is the shape of the data? Can we identify what the maximum and minimum numbers are, how spread out they are, and whether some of the numbers cluster together?
Let’s examine the trees dataset provided with base R. To see a description of this data, type the following:
> ?trees
A new window opens, describing the data. Following is the information provided in the window: