A compound bar graph, also known as a stacked bar graph, is a type of graphical representation that displays multiple data sets using a series of horizontal or vertical bars. In a compound bar graph, each bar is divided into segments or sections that represent different categories or sub-groups within the data.
The main purpose of a compound bar graph is to compare the total values of different categories and observe the distribution or composition of each category within the whole. Each segment of the bar corresponds to a specific category, and the length or height of the segment represents the magnitude or proportion of that category within the total value.
Compound bar graphs are effective for illustrating both the individual values of different categories and the relationships between them. By stacking the segments on top of each other, the graph provides a visual representation of how the different categories contribute to the whole. This allows for easy comparisons and identification of patterns or trends within the data.
The compound bar graph is especially useful when comparing data sets that have a common measurement unit or when analyzing data over multiple time periods. It provides a clear visual representation of the relative sizes and proportions of each category and allows for easy interpretation of the data.