Quantitative with quantitative variables

Scatterplots are often used to show relationships between two quantitative variables. In the following code, we will use the R pairs() function to plot some associations. As you can see, Petal.Width has a strong relationship with Petal.Length (row 3, column 4), while the relationship between Sepal.Width and Sepal.Length (row 1, column 2) is not as strong.