The selection between bar charts and pie charts is governed by the principle that visual encoding must align with the specific comparative objective: bar charts facilitate ordinal comparison across categories via linear height, whereas pie charts optimize for assessing part-to-whole proportions when the aggregate total holds intrinsic semantic meaning. This distinction relies on formal classifications where categorical (qualitative) variables define discrete groups and numerical (quantative) variables represent magnitudes or percentages, establishing a theoretical framework that prioritizes data structure semantics over arbitrary presentation choices.
The selection between bar charts and pie charts is governed by the principle that visual encoding must align with the specific comparative objective: bar charts facilitate ordinal comparison across c…