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Archives for February 2011

Robert Kosara / February 22, 2011

Tableau Public’s New Data Policy

Tableau made a huge mistake when they pulled a visualization of WikiLeaks statistics from their Tableau Public website a few months ago. But they’ve used the opportunity to develop a new policy for content posted there that is very clear and based on the idea of free speech. This removes a big obstacle for journalists who want to use the service: they no longer have to fear that their hard work might be destroyed because somebody does not like it. [Read more…] about Tableau Public’s New Data Policy

Robert Kosara / February 13, 2011

Anscombe’s Quartet

Visualization may not be as precise as statistics, but it provides a unique view onto data that can make it much easier to discover interesting structures than numerical methods. Visualization also provides the context necessary to make better choices and to be more careful when fitting models. Anscombe’s Quartet is a case in point, showing that four datasets that have identical statistical properties can indeed be very different. [Read more…] about Anscombe’s Quartet

Robert Kosara / February 8, 2011

Blur and Uncertainty Visualization

When visualizing uncertainty in data, a common choice is to use blur. While that may seem natural, it is unfortunately ineffective. Blur has the effect of guiding attention, but is hard to quantify and annoying to look at. Uncertainty information, or any other data, cannot be shown effectively this way. [Read more…] about Blur and Uncertainty Visualization

Robert Kosara / February 2, 2011

Tufte and the Truth about the Challenger

Almost exactly 25 years ago, on January 28, 1986, Space Shuttle Challenger disintegrated seconds after lift-off. One of Edward Tufte’s most famous examples of bad charts are the ones used by engineers who argued against the launch, and who failed to convince. It’s a fascinating story, but it has one major fault: it is not true. [Read more…] about Tufte and the Truth about the Challenger

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Copyright © 2006–2018 Robert Kosara · All original materials are available under CC-BY-SA