Writing

So much for “wonderfully simple”

In contrast to the clarity and simplicity of the New York Times info graphic mentioned yesterday, the example currently on their home page is an example of the opposite:

This is helpful because it clarifies the point I tried to make about what was nice about the other graphic. Because of space limitations, this graphic is small, and the information is stored across multiple panels. So at the top there are a pair of tabs. Then within the tabs we have a pair of buttons. Two tabs, four buttons, just to get through four possible pieces of data. That’s the sort of combinatoric magic we see in Microsoft Windows preference panels:

snap1.gif

While the organization in the info graphic makes conceptual sense—first you must choose one of two states, then choose one of the candidates—it makes little cognitive sense. We’re choosing between one of four options. Just give them to us! For a pair of items beneath another pair of items, there’s no need to establish a sense of hierarchy. If there were a half dozen states, and a half dozen candidates, then that might make sense. Just because the data is technically hierarchic, or arranged in a tree, that doesn’t mean that it’s the best representation for it.

The solution? Just give us the four options. No sliding panels, trap doors, etc. Better yet, superimpose the Clinton and Obama data on a single map as different colors, and have a pair of buttons (not tabs!) that let the viewer quickly swap between Indiana and North Carolina.

(This only covers the interaction model, without getting into the way the data itself is presented, colors chosen, laid out, etc. The lack of population density information in the image makes the maps themselves nearly worthless.)

Tuesday, May 6, 2008 | infographics, interact, politics  
Book

Visualizing Data Book CoverVisualizing Data is my book about computational information design. It covers the path from raw data to how we understand it, detailing how to begin with a set of numbers and produce images or software that lets you view and interact with information. Unlike nearly all books in this field, it is a hands-on guide intended for people who want to learn how to actually build a data visualization.

The text was published by O’Reilly in December 2007 and can be found at Amazon and elsewhere. Amazon also has an edition for the Kindle, for people who aren’t into the dead tree thing. (Proceeds from Amazon links found on this page are used to pay my web hosting bill.)

Examples for the book can be found here.

The book covers ideas found in my Ph.D. dissertation, which is basis for Chapter 1. The next chapter is an extremely brief introduction to Processing, which is used for the examples. Next is (chapter 3) is a simple mapping project to place data points on a map of the United States. Of course, the idea is not that lots of people want to visualize data for each of 50 states. Instead, it’s a jumping off point for learning how to lay out data spatially.

The chapters that follow cover six more projects, such as salary vs. performance (Chapter 5), zipdecode (Chapter 6), followed by more advanced topics dealing with trees, treemaps, hierarchies, and recursion (Chapter 7), plus graphs and networks (Chapter 8).

This site is used for follow-up code and writing about related topics.

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