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Jon Peltier

Wow, what a poor set of tutorials. You've presented the worst of them here, but not the only inappropriate one.

Their temperature by day chart challenges the eye with excessive gridlines, and the text describes the data as continuous, even though it shows only one measurement per day.

Chris Hibbert

What restraint! You didn't even complain that they seem to be using a pie chart to compare independent data points. The chart about GP consultations should be a bar chart, since the point is to compare the countries side-by-side rather than to emphasize that they make up a single whole (they don't.)

Xan Gregg

It's easier to answer the questions once you realize the countries/wedges are ordered by size!

zbicyclist

More proof that just about the only chart more abused than the pie chart is the 3-D pie chart.

Kaiser

Chris - great catch. While I was obsessing with figuring out the sizes of the pieces, the biggest blunder was missed. A pie chart used to present data that aren't proportions.

Doug

My retirement plan website uses pretty much the same technique to show my current investments.

I've always thought the pie chart seemed so lonely and sad next to the key, which contains all the useful data anyway.

Kaiser

Doug: that's exactly what I call self-sufficiency on this blog. If all the data have to be shown anyway for the chart to make sense, then the chart is not self-sufficient, and thus redundant.

sara

Well… I visit your website first time and found this site very useful and interesting! Well… you guys doing nice work and I just want to say that keep rocking and keep it up!!!!

Sara
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Gabor

Yes it's a bad chart. A horizontal bar chart would imho be a more appropriate solution (x-axis = time spent). If you go to the original page, you see that this chart was "inspired" by an 'average reading time' chart where a pie chart makes some sense. The whole is part of a series presenting different chart types, so it had to be a pie chart, damn the usability.
However, I see some upsides. These are worksheets to be printed out and worked on by (adult) pupils and students. Such worksheets are commonly in Black-and-White only. So a B/W print is still legible or at least dicipherable, even from a bad printer. It seems like a conscious effort to avoid colors. Better than to use a color design which then is printed out B/W. I can't totally condone this, as I think there are good reasons for schooling material to stick to B/W, cost of color prints being one. Obviously, B/W design also does not discriminate the colour-blind.
The shading scheme reminds me of tinctures in heraldry, see http://en.wikipedia.org/wiki/Heraldic#Tinctures. The pie chart use is still wrong.

Such a nice justification for B/W design and then the same people go and make a worksheet like this: http://en.wikipedia.org/wiki/Heraldic#Tinctures

unrelated P.S. Is there a simple, old-fashioned e-mail-address available to contact Junk Charts author/Kasier Feng ? I have a really bad chart itching to be sent in.

Gabor

[erratum to my comment above]
Such a nice justification for B/W design and then the same people go and make a worksheet like this: http://www.bbc.co.uk/skillswise/numbers/handlingdata/numericalanalysis/mean/factsheet1.shtml

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Marketing analytics and data visualization expert. Author and Speaker. Currently at Vimeo and NYU. See my full bio.

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