Data Visualizationmedium
0:00.0
A dual-axis line chart compares two companies:
— Left axis (0 to 100%): Company A's market share percentage
— Right axis ($0 to $1000M): Company B's annual revenue
Over the time period: Company A's line rises from 50% to 55% (a 5 percentage-point change). Company B's line rises from $500M to $505M (a $5M change). Visually, both lines appear to have nearly identical slopes. Why is this visualization misleading?
A dual-axis line chart compares two companies: — Left axis (0 to 100%): Company A's market share percentage — Right axis ($0 to $1000M): Company B's annual revenue
Over the time period: Company A's line rises from 50% to 55% (a 5 percentage-point change). Company B's line rises from $500M to $505M (a $5M change). Visually, both lines appear to have nearly identical slopes. Why is this visualization misleading?