Author

Xan Gregg
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JMP Development

Xan Gregg is a JMP Development Senior Manager with expertise in data visualization and scripting. In 2006, he won first place in Business Intelligence Network's Data Visualization Competition. Gregg has worked for JMP for ten years and is the inventor of Graph Builder. He holds a Bachelor of Science in computer engineering from Clemson University.

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When are the Summer Games, historically?

The Summer Games are over, and here's one thing that surprised me. I had assumed that since Rio is in the southern hemisphere, where it’s currently winter, the Games would be shifted a couple months, as they were for Sydney. I’ve since learned that Rio is very pleasant in the winter

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Exploring 30 years of car colors

Montgomery County, Maryland, publishes all traffic violations since 2013, now totaling more than 780,000 incidents. Besides the location and details of the violations, the table also contains information about the vehicles involved, such as make, model, year and color. It’s car colors that I want to explore here. Even though

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Graph Makeover: Bars on a log scale

Every once in a while, I run across a bar chart on a log scale, and it always feels wrong. At first glance, I compare the bar lengths and start making comparisons. But eventually, I notice the log scale on the axis and try to convince my brain to forget everything

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Remaking a mosquito trends chart

Recreating graphs is a hobby of mine. It both helps me test the limits of JMP and sharpens my own data handling and visualization skills. This time, there was a third benefit: finding a significant data error in the published chart. I recently saw this interesting mosquito trends chart as

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Graph Builder tutorial materials

I'll be leading a pre-conference tutorial on Graph Builder at this year's Discovery Summit conference in Cary. We'll start with the basics and then walk through more advanced ways to create effective visualizations. We did a similar tutorial this spring in Amsterdam, and materials from that course are posted in the JMP

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Visualizing data quality with FAA drone data

I used JMP to explore a recent FAA drone data set, inspired by a weekly data visualization challenge called 52Vis. The data set contains "reports of unmanned aircraft (UAS) sightings from pilots, citizens and law enforcement." I decided to focus on exploring the time data. I'll describe how I prepared the time

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#OneLessPie for Pi Day

Last week, I celebrated the progress we've seen in cleaning up wayward pie charts, and today I again use Pi Day as an opportunity to give the world #OneLessPie. Since I am at Discovery Summit Europe in Amsterdam this week, I chose a European topic for my makeover. I started

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Progress on #OneLessPie

Pi Day (3/14) is next week, and once again, we are encouraging everyone in the data visualization community to use this day as motivation to help clean up ineffective pie charts within their organization or in public spaces like Wikipedia. I think there is still a mindset outside of our community that a pie

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Graph Makeover: Where same-sex couples live in the US

The following map appeared in an article titled "Where Same-Sex Couples Live" in the Upshot section of The New York Times shortly after the US Supreme Court decision ruled that the Constitution grants the right to same-sex marriage throughout the US. The map coloring shows the proportion of same-sex couples

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How to create an axis break in JMP

I’ve been asked three times this year about how to make a graph in JMP with an axis break. Before I show how, I want to ask “Why?” The obvious answer to “Why?” is “to show items with very different values in one graph,” but that’s a little unsatisfying. I

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