Pie chart

19 posts
Details, details, details: giving Zillow a pie treatment

This chart (shown right), published by Zillow in a report on housing in 2012, looks quite standard, apparently avoiding the worst of Excel defaults. In real estate, it’s all about location. In dataviz, it’s all about details. What are some details that I caught my eye on this chart? Readers have to get over the hurdle that “negative equity” is the same as “underwater homes.” This is not readily understood...

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Wheel of fortune without prizes: the negative report about negativity

My friend, Louis V., handed me a report from Harvard's Shorenstein Center, with the promise that I can make a blog post or two from it. And I wasn't disappointed. This report (link) caught some attention a few months ago because of the click-bait headline that the media is "biased" against Trump in his first 100 days. They used the most naive definition of "bias". The metric is the amount...

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Unintentional deception of area expansion #bigdata #piechart

Someone sent me this chart via Twitter, as an example of yet another terrible pie chart. (I couldn't find that tweet anymore but thank you to the reader for submitting this.) At first glance, this looks like a pie chart with the radius as a second dimension. But that is the wrong interpretation. In a pie chart, we typically encode the data in the angles of the pie sectors, or...

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Making the world a richer place #onelesspie #PiDay

Xan Gregg and I have been at it for a number of years. To celebrate Pi Day today, I am ridding the world of one pie chart. Here is a pie chart that is found on Wikipedia: Here is the revised chart: It's been designed to highlight certain points of interest. I find the data quite educational. These are some other insights that are not clear from the revised chart:...

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Light entertainment: We’re very sorry but this is NOT a pie chart

Someone at YouGov learned an important lesson in what not to do in #dataviz... (Tip from Rob M. via Twitter) The tweet storm it unleashed was not worth the cute idea. Here are their tweets:  

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Pie charts are okay

There were some ripples in the space time continuum recently about a pizza and a pie chart. It looked like a pie chart but was actually just a pizza with numbers around it. Those numbers didn’t sum to 100 percent, so there were pitch forks and burning and like I said, ripples in the space time continuum. Here, have a look for yourself: It’s social media filler content, so whatever....

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Members Only: How to Make Square Pie Charts in R

Instead of traditional pie charts that rely on angles and arc lengths to show parts of a whole, try this easier-to-read version. Read More

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Square pie chart beats out the rest in perception study

Many hate pie charts. Others love them. I think they’re useful but have limitations. Most of these are just feelings though, maybe accompanied by an Edward Tufte quote. We need facts. Robert Kosara and Drew Skau provide some in their recent studies on how we read pie charts. There appears to be a good chance people don’t read the things correctly. But I found Kosara’s follow-up more interesting. He dug...

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First ask the right question: the data scientist edition

A reader didn't like this graphic in the Wall Street Journal: One could turn every panel into a bar chart but unfortunately, the situation does not improve much. Some charts just can't be fixed by altering the visual design. The chart is frustrating to read: typically, colors are used to signify objects that should be compared. Focus on the brown wedges for a moment: Basic EDA 46%, Data cleaning 31%,...

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Light entertainment: March Madness and Wheel of Fortune

March Madness (via Business Insider): Wheel of Fortune:

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