n. a method of displaying statistical data through rectangular bars which vary in length and height. These bars are separated by spaces to make them discrete. Ideal when the x variable is non-numerical, such as gender or political affiliation. Coorespondingly, the height or length of the bar is plotted in proportion to the y variable. See bar chart. Compare histogram.
BAR GRAPH: "The use of a bar graph is preferred when one out of two variables happens to be non-numerical."