ADVANTAGES AND DISADVANTAGES OF PROPORTIONAL CIRCLES

6 ADVANTAGES AND 7 DISADVANTAGES OF PROPORTIONAL CIRCLES

In proportional circles, the size of each circle is proportional to the total value of the data it represents, e.g. the largest value is represented by the largest circle




Advantages of proportional circles

  • Proportional circles are suitable where it is necessary to compare absolute totals such as total crop production or export earnings in different periods.
6 ADVANTAGES AND 7 DISADVANTAGES OF PROPORTIONAL CIRCLES
  • They give a good visual impression of totality. This makes the comparison of totals easy as the size of each circle corresponds to the total amount it represents.
  • They can be combined with other methods on the same map to assist in data analysis especially when describing population distribution.




Disadvantages of proportional circles

  • This is a very tedious and rime-consuming method of representing data since the diameter and radii measurements have to be calculated.
  • It is not possible to determine the actual total values for each period from the circles since the totals are represented by the sizes of the circles.
  • Where the sets of data to be represented are many, the comparison of the circles becomes difficult.
  • Where the differences between the values being represented are too big, it becomes difficult to represent the extreme values as it results in very big and very small circles.




  • Where the differences in the values to be represented are very small, all the circles will be almost the same size, making comparison very difficult.

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