Research on human perception concludes that the bar chart is preferred to the pie chart,because the human eye can more accurately judge length comparisons against a fixed scale (as in a bar chart)than angular measures (as in a pie chart).

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Research has indeed found that the bar chart is preferred to the pie chart because the human eye is better at judging length comparisons against a fixed scale, as opposed to angular measures in a pie chart.

Research on Human Perception Concludes That the Bar Chart Is