Variance

10 posts
Governor of Maine wants a raise

In a Trifecta checkup, this map scores low on the Q corner: what is its purpose? What have readers learned about the salaries of state governors after looking at the map? (Link to original) The most obvious "insights" include: There are more Republican governors than Democratic governors Most Democratic governors are from the coastal states There is exactly one Independent governor Small states on the Eastern seaboard is messing up...

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Light entertainment: the difference in power between nations is not statistically significant

As proved by the following chart:  

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A look at how the New York Times readers look at the others

The above chart, when it was unveiled at the end of November last year, got some mileage on my Twitter feed so it got some attention. A reader, Eric N., didn't like it at all, and I think he has a point. Here are several debatable design decisions. The chart uses an inverted axis. A tax cut (negative growth) is shown on the right while a tax increase is shown...

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Excellent visualization of gun violence in American cities

I like the Guardian's feature (undated) on gun violence in American cities a lot. The following graphic illustrates the situation in Baltimore. The designer starts by placing where the gun homicides occured in 2015. Then, it leads readers through an exploration of the key factors that might be associated with the spatial distribution of those homicides. The blue color measures poverty levels. There is a moderate correlation between high numbers...

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The visual should be easier to read than your data

A reader sent this tip in some time ago and I lost track of who he/she is. This graphic looks deceptively complex. What's complex is not the underlying analysis. The design is complex and so the decoding is complex. The question of the graphic is a central concern of anyone who's retired: how long will one's savings last? There are two related metrics to describe the durability of the stash,...

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Diverging paths for rich and poor, infographically

Ray Vella (link) asked me to comment on a chart about regional wealth distribution, which I wrote about here. He also asked students in his NYU infographics class to create their own versions. This effort caught my eye: This work is creative, and I like the concept of using two staircases to illustrate the diverging fortunes of the two groups. This is worlds away from the original Economist chart. The...

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Let’s not mix these polarized voters as the medians run away from one another

Long-time follower Daniel L. sent in a gem, by the Washington Post. This is a multi-part story about the polarization of American voters, nicely laid out, with superior analyses and some interesting graphics. Click here to see the entire article. Today's post focuses on the first graphic. This one: The key messages are written out on the 2017 charts: namely, 95% of Republicans are more conservative than the median Democrat,...

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Let’s not mix these polarized voters as the medians run away from one another

Long-time follower Daniel L. sent in a gem, by the Washington Post. This is a multi-part story about the polarization of American voters, nicely laid out, with superior analyses and some interesting graphics. Click here to see the entire article. Today's post focuses on the first graphic. This one: The key messages are written out on the 2017 charts: namely, 95% of Republicans are more conservative than the median Democrat,...

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Getting into the heads of the chart designer

When I look at this chart (from Business Insider), I try to understand the decisions made by its designer - which things are important to her/him, and which things are less important. The chart shows average salaries in the top 2 percent of income earners. The data are split by gender and by state. First, I notice that the designer chooses to use the map form. This decision suggests that...

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A long view of hurricanes

This chart by Axios is well made. The full version is here. It's easy to identify all the Cat 5 hurricanes. Only important ones are labeled. The other labels are hidden behind the hover. The chart provides a good answer to the question: what time of the year does the worst hurricanes strike. It's harder to compare the maximum speeds of the hurricanes. I wish there is a way to...

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