« Be guided by the questions | Main | Experiments in simplification »



in the previous plot you 'promised' to explain how you grouped the countries. So how did you group them?


I would redo Redo_Pisa3 (the first pair of graphics at the top) so that:

a) the scale "UK differential from other OECD countries" was actually "other OECD countries differential from UK", so that the better scores are not confusingly negative

b) the scale graph is turned on its side to be vertical

c) the table at left is placed on the right of the scale graphic, with leader lines between the positions on the scale and the country labels

Now it's not two graphics, but one. I might also turn the triangles into solid lines between the highest and lowest score in the group, keeping the blurring that simplifies the graph, but giving an idea of the size of the in-group range and the gaps between groups.

Jon Peltier

As I suggested in my comment to the previous post, I would have plotted the Redo_pisa3 plot so better is to the right, not to the left. Derek suggested changing the labels, but this would have kept better performance to the left, which is still confusing.

Peter H

I definitely like the scatter plots best. I was kind of surprised before that some countries (like mine, Sweden) jumped so many steps between the three different ranks. But the scatterplots are really tight, so the jumps can't be that bad...


I posted the below comment in the wrong thread. Sorry.

I believe it would be interesting to caculate a multi-trait multi-method matrix with the three different tests. See how the correlation between each subject relates to one another.



The B1 group of countries performed [...] about 8x better than group B2.

What does it mean 8x better (and, in general, y times better) on a standardized scale?

Verify your Comment

Previewing your Comment

This is only a preview. Your comment has not yet been posted.

Your comment could not be posted. Error type:
Your comment has been posted. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.


Post a comment

Your Information

(Name is required. Email address will not be displayed with the comment.)


Link to Principal Analytics Prep

See our curriculum, instructors. Apply.
Marketing analytics and data visualization expert. Author and Speaker. Currently at Columbia. See my full bio.

Book Blog

Link to junkcharts

Graphics design by Amanda Lee

The Read

Good Books

Keep in Touch

follow me on Twitter