Line charts are one of the most common and useful charts out there. But why draw straight lines between the data points? They almost never represent what the data is actually doing, no matter if the data is single observations or aggregated over time. How do line charts actually work, and what do they imply about the data?
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eagereyesTV: Index Charts, Part 2: Chopping Up and Folding the Time Axis
I covered the more commonly known value index charts in my my last video on index charts, this one is about indexing on the horizontal, or time, axis. It’s kind of fascinating how you can fold the time axis to get a better view of your data. I show how it works and walk through a number of examples, using housing prices, camera sales, global warming, and even data about my running!
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eagereyesTV: Index Charts, Part 1: Making Time Series Data Comparable
To show change over time, you typically use a line chart. But when you’re comparing time series whose values are very different, the differences between the lines can obscure the changes within them. Index charts can help with that. They align values to a reference, or fold the time axis on itself, or even do both.
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More Things To Do at VIS: BELIV, VisLies, Social Media Meetup, Etc.
For next week’s IEEE VIS conference, here are some more pointers to things that I think are worth checking out in addition to my previous list. This includes a few of the major events as well as some meetups you might otherwise have missed.
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An Outsider’s Guide to the IEEE VIS Conference 2020
Want to watch a keynote by a Nobel laureate, catch the presentations of the best papers, or attend a workshop on visualization for communication? The IEEE VIS conference is taking place online in two weeks, October 25 to 30, and is free to attend this year. Here are a few starting points if you’ve never been to VIS and don’t know why you should attend or what to watch.
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What Happened to ISOTYPE?
Jan Willem Tulp asked me an interesting question on Twitter last week: if ISOTYPE was so great, why isn’t anybody using it anymore? Here are some of my thoughts, but more than that I want to see if anybody has more idea, and maybe even a bit of evidence, on why ISOTYPE fell out of fashion in the 1950s and hasn’t really come back since.
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New eagereyesTV Video and Series: Chart Appreciation
Time to breathe new life into my little YouTube channel, which I’m calling eagereyesTV. I’m doing so with the start of a new series I’m calling Chart Appreciation. Each episode will be on one particular visualization, news piece, or interactive. As the first one, I picked Hannah Fairfield’s Driving Safety, in Fits and Starts from 2012.
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Prior Work We Missed In Our Connected Scatterplots Paper
In 2016, Steve Haroz, Steven Franconeri, and I published a paper on a technique commonly called the Connected Scatterplot. It turns out that somebody else had research on essentially the same chart 15 years earlier, which we were not aware of. Our work is quite different, but it’s interesting context and it’s also worth reflecting on how we missed this piece of relevant prior work.
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Tracking 19,000 Runners Over 1,000km Across Virtual Tennessee
How do you show large numbers of people without losing track of the outliers? How do you keep a chart useful when the maximum values are orders of magnitude higher than the common ones? In an animated visualization I’ve built of the progress of over 19,000 runners across a virtual 1000km (635mi) race over 123 days, I’ve tried to solve some of these issues.
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CFP: The Third Workshop on Visualization for Communication (VisComm) at VIS 2020
At IEEE VIS this year, we’re organizing the third Workshop on Visualization for Communication, also known as VisComm. The deadline is July 16, so still plenty of time to put together a paper, whether on communicating around COVID-19 or not. We’re not only looking for the usual academic research, but also visual case studies, which means work by journalists, designers, or non-profits.
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