The following map accompanied an article in the Economist about China's drive to create a "digital silkroad," roughly defined as making a Silicon Valley. 

Economist_digitalsilkroad

The two variables plotted are the wealth of each province (measured by GDP per capita) and the level of Internet penetration. The designer made the following choices:

  • GDP per capita is presented with less precision than Internet penetration. The former is grouped into five large categories while the latter is given as a percentage to one decimal place.
  • The visual design favors GDP per capita which is encoded as the shade of color of each province. The Internet penetration data appeared added on as an afterthought.

If we apply the self-sufficiency test (i.e. by removing the printed data from the chart), it's immediately clear that the visual elements convey zero information about Internet penetration. This is a serious problem for a chart about the "digital silkroad"!

***

If those two variables are chosen, it would seem appropriate to convey to readers the correlation between the two variables. The following sketch is focused on surfacing the correlation.

Redo_jc_china_digitalsilkroad2

(Click on the image to see it in full.) Here is the top of the graphic:

Redo_jc_china_digitalskilkroad_detail

The individual maps are not strictly necessary. Just placing provincial names onto the grid is enough, because regional pattern isn't salient here.

The Internet penetration data were grouped into five categories as well, putting it on equal footing as GDP per capita.

 

Tags:
junkcharts
http://junkcharts.typepad.com/junk_charts/

Comments are closed.