A reader need go no further than page two of Leland Wilkinson’s The Grammar of Graphics before reading, “We will also come to realize why a histogram is not a bar chart and why many other graphics ...

The simplest histogram displays a two-dimensional visualization of a single variable. For example, the following histogram shows the frequency for the single variable Age, specified for the X axis.

In a plant producing copper wire, an important quality characteristic is the torsion strength, measured as the twisting force in pounds per inch necessary to break the wire. The following statements ...