Teaching:TUW - UE InfoVis WS 2006/07 - Gruppe 08 - Aufgabe 2

Poor Graphic

Sotheby's / Christie's Worldwide Sales Market Share Analysis

Criticism

• Gradient-fill of the year-columns - unnecessary Chartjunk.
• Six cakes for one data-row - very low Data Density.
• The individual pie charts are virtually indistinguishable, making pie charts a rather poor choice in this context.
• The pie charts are arranged diagonally without any meaning (except for the growing years).
• The position of the pie charts suggests an increase on the y-axis which doesn't have any function or labels.
• Four graph-labels in different font with redundant information.
• The labels are not anywhere near the pie charts and have to be found to derive any meaning from the charts.

Improved Graphic

File:LineChart.jpg

Sotheby's / Christie's Worldwide Sales Market Share Analysis - Improved Graphic - Variant 1

Improvements

• Market share changes are visible over the years.
• Removed confusing and unnecessary backgrounds.
• Increased data-ink ratio.
• Labels are clearly visible next to the lines.
• Difference between market shares easy to determine.

Variation

File:ColumnChart.jpg

Sotheby's / Christie's Worldwide Sales Market Share Analysis - Improved Graphic - Variant 2