A Dot Chart, also known as a scatter plot (also called a scatterplot, scatter graph, scatter chart, scattergram, or scatter diagram) is a type of plot or mathematical diagram using Cartesian coordinates to display values for typically two variables for a set of data. This plot is useful for highlighting clusters, gaps, and outliers. A measure of the relationship between two variables is called a correlation. If it is possible to draw a nearly straight line between markers on a dot diagram, the correlation between these variables is high; if markers are distributed evenly, then the correlation is low or even equals zero.
Quadrant Chart of the best music albums, based on KEXP's poll data. The visualization is helpful in understanding the correlation between the number of DJ plays and the level of listeners' appreciation and in identifying the best overall albums and artists from this perspective.