Percentage Bar Diagrams:
When data should be compared between the group and the variable is composed of various interrelated components, it is appropriate to present these values by percentage bar diagrams. In other words, when the relative proportions of components of a bar are more important than their absolute values, then each bar can be constructed with the same size to represent 100 percent. The component values are then expressed in terms of percentage of the total to obtain the necessary length for each of these in the full length of the bars. The other rules regarding the shades, index, and weight are the same as in multiple bar diagram.
Example:
Expenditure of a family of the year 2010 is given. Represent the data by percentage bar diagram.
| Items | Expenditure (Rs.) |
| Cloths Food Education Health Miscellaneous |
500 800 400 200 100 |
Solution:
| Items | Expenditure (In percentage) |
| Cloths | 500/2000*100% = 25 % |
| Food | 800/2000*100%=40 % |
| Education | 400/2000*100%=20 % |
| Health | 200/2000*100%=10 % |
| Miscellaneous | 100/2000*100% =5 % |
Above diagram is the example of Percentage Bar Diagram.
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