Four reasons to unplug radar charts
Ouch, ouch, ouch, ouch
Gridlines
Visualizing hierarchies
Bonus: setting gridlines on a circular chart
Don't show everything
Plotting lots of data but conveying not much information
Dizziness
Dizziness is probably not an intended goal of charting
Tidying up the details
Fixing up little details on a data graphic pays dividends
Excess delay
Kaiser finds a chart that analyzes London's congestion charging programme.