07 January 2022

The New York Times COVID-19 serpent

 Opinion is split on this New York Times graph:

CVOID-19 cases plotting by width of line in a spiral, with month the points on the radius.

This spiral is showing the same thing as this:

Line graph of VOIC-19 cases

A lot of people were dunking on the circular top graph. Zach Freed, who wrote, “Literally no reason to make this graph into a spiral.”

But several data viz folks perked up to defend it (here, here, here, here, here, here). (I’m not pasting in the quotes because I want to finish this post.)

And there are already remixes floating around. Amerlia Wattenberger has several.

I am more on the “detractor” side than “supporter” side. To me, this looks a lot like being different just for the sake of being different. And I don’t like that distance from center seems to be purely arbitrary.

Now, there are arguments that maybe being different is a good thing here. Neil Richards wrote, “(I)f it gets us talking about it, the chart's doing a great job!”

Yeah, but we’re talking about the graph and not the data or the ideas in the article.

It’s like when CERN announced the confirmation of the Higgs boson on slides using Comic Sans. Suddenly, people were talking about the typeface and not the data or the significance of the discovery.

The big potential advantage of a circular graph is that it is the best way to show circular data. If the big point of the graph was to explore whether COVID-19 was seasonal, yes, then this would start to make a lot more sense.

But that’s not what the article is about. Besides, even if the point was, “COVID-19 sure looks seasonal, peaking in December,” that’s n = 2 in any case.

I think Alyssa Fowers’s point that this is at the top of an op-ed article is relevant. I don’t think this is meant to show data; I think this is intended as an illustration that is based on data. I am willing to be the phrase 

“Spiralling out of control”

was uttered at some point in a story meeting. And that was the driving force leading to this graph.

Regardless of whether this plays in the “paper of record,” where people are expected to be able to spend all the time they want poring over it while sipping a hot beverage, I absolutely would not recommend this kind of graph on a conference poster.*

One of the main reasons we standardize graphs is that you don’t have to re-learn and decipher graphs anew every time. In a poster session setting, where people are busy and distracted, it’s a little rude to foist a non-standard graph on your audience if another type of graph is a much more common way of showing the data.

* Unless you were trying to show seasonality. And if you were trying to show seasonality, I would explictly annotate that on the graph.

Update, 8 January 2022: This makeover from Joe Travers is closer to what I might do. I would want some way to put the two years on the same scale, though.

Circular graph of COVID-19 cases from 2020 and 2021.

Another update, 8 January 2022: I should be writing a syllabus, not remixing graphs. Yet here I am.

CIrcular plot of new COVID-19 cases in Canada.


This is a quick and dirty proof of concept. Yes, I know the months are sloppily positioned. Yes, I know there are other things that need fixing. But I was too curious what a circular plot looked like.

Dates are a pain to work with. Spreadsheets and graphing software really, really, really want your dates to include a year and add one if you don’t. Not to mention leap years, like 2020 was.

The spiral graph was by Gus Wezerek and Sara Chodosh, though it's not clear if one or both were responsible for this particular graph.

External links

Here’s When We Expect Omicron to Peak

06 January 2022

Critique: Particulate matters

Alexandra Lai is a repeat customer of the blog. She was kind enough to share her work some time ago. She wrote, “I appreciated your critique so I am coming back for more!”

Well, when someone asks, I have to give it. Click to enlarge!

Poster titled, "From personal exposures to cell exposures Cytotoxicity and chemical composition of women’s personal PM2.5 exposures in rural China"

When I open a poster for review, there’s always that first reaction. Sometimes, it’s an overall impression that makes me go “Ooooh...” it I like it or that sound of sucking air through my teeth if I don’t. But sometimes, it’s one thing that you spot right away and you cant let go of.

It’s down in the lower right.

Headings do not just convey information about sections. They help divide a work into chunks, carving the poster at its joints. Here’s the poster with the headings at the top of each section.

While I personally have written about how I dislike changing column widths, I have very little confusion about what the sections are or what order to read the poster.

But in the lower left corner, the short heading accidentally isolates the last column,

We assume that everything under a heading  belongs to that heading. So anything that is not under a heading doesn’t feel like it belongs to anything.

Think of a heading like an umbrella.

Shadow of person holding an umbrella with the edge of the umbrella over the head, leaving on side of the body not under the umbrella.

Doesn’t just looking at that umbrella just make you want to reach in and pull it over the body? Like this?

Shadow of person holding an umbrella with the handle of the umbrella near the body, covering the body under the umbrella.

There are a few minor typographic issues that might be addressed. I strongly suspect that typesetters would not want a line to begin with a dash

– which happens in the first heading.

Similarly, I don’t think it’s common for ellipses to end one line or section…

… And use ellipses again to start the next line or section, which happens in the rightmost headings and in the text. Text lines should start with words, not symbols. 

These sorts of decisions are why professional book typesetting, even now, is at least checked by professional typesetter and not isn’t automated like Word documents. Placing line breaks and hyphens are not easily encapsulated in algorithms.

The rest of the poster has a consistent use of contrast colours, blues and oranges, that help add visual interest.

I thank Alexandra for sharing her work again, and wouldn’t mind seeing a third sometime!

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