Understanding heat maps, tree maps, and geographic maps
The final category of visualizations you need to know for the exam is the maps: heat, tree, and geographic. These may or may not be what you would think of when you hear the word map. A map is a visualization that depicts the relationship between different elements based on some variable. A traditional map, a geographic map, shows the distance and direction between separate points so that you can see how to get from one area to another. However, not all maps denote locations in space like a geographic map does. Let’s jump right in and you will see for yourself.
Heat maps
Heat maps are interesting and often colorful. A heat map compares two qualitative variables, almost always scales, and one quantitative variable. These are designed to see whether there is a relationship between the two scales and that relationship is reflected in the changes in the quantitative variable. It will be easier to see one, so let’...
