Represent Data: Create Compound Bar Graphs (Side-by-side and Stacked) . Concept/s in Focus: 👉 Compound bar graphs can be used to represent data to show more than one variation of each category. 👉 When using bar graphs to display discrete categorical data the bars for each category should have a space between them. 👉 Compound bar graphs can display the data for the variations in each category as side-by-side bars or stacked bars. 👉 Stacking the bars in compound bar graphs shows the total for