Statements

Make a clear statement with your plots

We now have a much-improved, multivariate, version of the original scatter plot, but it’s not complete. We want to show the reader the relationship between sepal width and length. In this case we can draw regression lines using a linear model to emphasise our observation.

Adding a trend line to each group emphasises the distinction between the species.

Minimize table look-ups

Symbol legends add another degree of separation, forcing the reader to look at two separate pieces of information and put them together. We can eliminate the symbol legend and directly label the plot.