A sub-divided or component bar chart is used to represent data in which the total magnitude is divided into different or components. In this diagram, first we make simple bars for each class taking the total magnitude in that class and then divide these simple bars into parts in the ratio of various components

A sub-divided bar chart may be drawn on a percentage basis. To draw a sub-divided bar chart on a percentage basis, we express each component as the percentage of its respective total. ... The diagram so obtained is called a percentage component bar chart or percentage stacked bar chart.

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Difference between Component Bar Diagram and Percentage Bar Diagram

Component Bar Diagram:
A component bar diagram is a type of bar graph that represents the different components or parts of a whole. It is used to visually display the relationship between the parts and the whole entity. Each component is represented by a separate bar, and the length of the bar indicates the magnitude or proportion of that component.

Percentage Bar Diagram:
A percentage bar diagram, also known as a stacked bar graph, is a type of bar graph that represents the distribution of a whole into different categories. It is used to compare the proportions or percentages of different categories within a dataset. Each category is represented by a separate bar, and the length of the bar indicates the percentage it contributes to the whole.

Differences:

1. Representation:
- Component Bar Diagram: It represents the components or parts of a whole. Each bar represents a separate component, and the length of the bar corresponds to the magnitude of that component.
- Percentage Bar Diagram: It represents the distribution of a whole into different categories. Each bar represents a separate category, and the length of the bar indicates the percentage it contributes to the whole.

2. Focus:
- Component Bar Diagram: It focuses on showing the relationship between the parts and the whole. It helps in understanding the composition of the whole entity.
- Percentage Bar Diagram: It focuses on comparing the proportions or percentages of different categories within a dataset. It helps in analyzing the distribution and relative contributions of each category.

3. Data Presentation:
- Component Bar Diagram: It presents the data in absolute values or quantities. The length of the bars directly represents the magnitude of the components.
- Percentage Bar Diagram: It presents the data in relative values or percentages. The length of the bars represents the proportion of each category in relation to the whole.

4. Interpretation:
- Component Bar Diagram: It allows for a detailed examination of the individual components and their relative sizes. It helps in understanding the specific contribution of each component.
- Percentage Bar Diagram: It facilitates the comparison of proportions and identifies the dominant and minor categories. It helps in identifying the distribution pattern and relative significance of each category.

Example:
- Component Bar Diagram: A component bar diagram can be used to represent the sales of different products in a company, where each bar represents the sales of a specific product.
- Percentage Bar Diagram: A percentage bar diagram can be used to represent the distribution of expenses in a budget, where each bar represents the percentage of expenditure on different categories like rent, utilities, food, etc.

In conclusion, the key difference between a component bar diagram and a percentage bar diagram lies in their representation, focus, data presentation, and interpretation. While the component bar diagram focuses on the relationship between parts and the whole in absolute values, the percentage bar diagram compares proportions in relative percentages. Both types of diagrams have their uses in different contexts and provide valuable insights into the data being presented.