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Sub-divided bar chart may be drawn on percentage basis. To draw sub-divided bar chart on percentage basis, we express each component as the percentage of its respective total. In drawing percentage bar chart, bars of length equal to 100 for each class are drawn at first step and sub-divided in the proportion of the percentage of their component in the second step. The diagram so obtained is called percentage component bar chart or percentage staked bar chart. This type of chart is useful to make comparison in components holding the difference of total constant.
Example:
The table below shows the quantity in hundred kgs of Wheat, Barley and Oats produced on a certain form during the years 1991 to 1994.
Construct a percentage component bar chart to illustrate this data.
Solution:
Necessary computations for the construction of percentage bar chart given below:
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Item |
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cum
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cum
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cum
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cum
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Wheat
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Barley
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Oats
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Total
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 indicates Percentage of each item
- cum
 indicates the cumulative percentage.
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