Thursday, August 16, 2007

Stacked columns - why stacked?

The benefit of stacked columns ...

"Visualization often focuses on changes in shares which are compared to a total. Stacked column graphs which add up to 100% are a common chart type. But not for more than three shares at once. Readability is becoming too bad. Even three cause problems.

My eye has to grasp the height of the top-most columns from the top down. The columns in the middle are even worse. My eye keeps jumping up and down to grasp their height. The source of the problem: the top line symbolizes 100%. This is also plain to any reader, if I tell him beforehand that everything adds up to 100%. Thus, no need to focus the design of the graph on this convention."    (Continued via Bella consults)    [Usability Resources]

Stacked Columns - Usability, User Interface Design

Stacked Columns

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