09. Scatter Plots

Scatter plots

Scatter plots are a common visual for comparing two quantitative variables. A common summary statistic that relates to a scatter plot is the correlation coefficient commonly denoted by r.

Though there are a few different ways to measure correlation between two variables, the most common way is with Pearson's correlation coefficient. Pearson's correlation coefficient provides the:

1. Strength
2. Direction

of a linear relationship. Spearman's Correlation Coefficient does not measure linear relationships specifically, and it might be more appropriate for certain cases of associating two variables.