Be aware that this visual separation produces a distortion in the chart that may make the message difficult to interpret. You can put the entire pie apart, or just highlight an individual slice depending on the narrative. The message can be reinforced by separating one or a few segments from the original pie. Of course, this gain in space must outweigh the new difficulty generated by having fewer visual attributes. For example, the legends corresponding to each sector can be indicated in the hole of the donut. Its use is justified when the information in the center allows gaining space and thus reducing the total space generated by the chart. Now it is not possible to make a comparison of areas, but the numerical values of the sectors are encoded only by means of arc lengths along the perimeter of the circle. They are absolutely equivalents to pie charts (they display parts of a whole of mutually exclusive and not overlapping categories), with the only difference being a blank space ( a hole) in the center of the chart where some kind of additional information is indicated to enhance the storytelling. Although they are aesthetically pleasing, they introduce distortion and hinders seriously the interpretation of the message.Īlternative 1: Donut Charts (Doughnut Charts) If you have numerous small sectors that are difficult to read, try to combine them into a single sector with a legend appropriate to the new situation and with a neutral color.They are not only hard to read but also there are too many legends. Try to not use more than six or seven slices.PCs should not be used for accurate comparisons, when differences between categories are minor, or for trends or patterns.Always include annotations and percentages to describe the content.For example, these requirements are not always verified in survey results.
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PCs encode the corresponding numerical values with two visual attributes: 1.- length of each slice along the perimeter 2.- area of each slice. Fig.1: a pie chart made by the author with Plotly Express.