Learn in the textbookBasic Charts and Visualizing Distributions
DefinitionA radar chart (レーダーチャート) assigns one evaluation item to each axis radiating from the center and shows the balance among the items through the shape of the polygon joining the values on each axis.
ExplanationValues grow toward the outer end of each axis, so the wider the polygon spreads, the higher the overall rating, and an axis that dents inward marks a weak item. Overlaying the polygons of several subjects or of the average lets you compare which items differ.
AnalogyScore a restaurant on taste, portion, price, service and cleanliness and draw it as a pentagon, and its strong and weak points show in how the shape leans.
Memory hookThe name comes from its look: lines radiating from the center, like a radar screen.