Multiple Bar Graph
A multiple bar graph contains comparisons of two or more categories or bars. One axis represents a quantity and the other axis identifies a specific feature about the categories. Reading a multiple bar graph includes looking at extremes (tallest/longest vs. shortest) in each grouping. The first example is a vertical multiple bar graph.
This sample contains a key that explain the colors for the categories; no practice and 12 hours practice. The y axis identifies the number (quantity) of misses. The categories are compared by age in hours.
The example to the right is a horizontal multiple bar graph. This sample contains a key that identifies the categories; countries or regions in the world. The x axis represents the quantities; thousands of quads of natural gas. The categories are compared by resources in each country or geographic region by amount of quads.