Pie chart is probably the most criticized chart type. Humans are pretty bad at reading angles, making it hard to rank the groups accurately. Most of the time, it is better to display the information as a barchart, a treemap or a lollipop plot.
Have a look to the 3 pie charts below, can you spot the pattern hidden in it?
Can you spot the pattern hidden behind those 3 pie charts? Click to see the same info visualized as barplots: much more insightful isn't it?
Last but not least, please avoid the explode and shadow options of the pie() function, they are killing all the most basic dataviz principles.
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