This is a quickie to describe a mathematical disconnect I encountered last week.
While my wife and daughter were shopping in the mall, I hunkered down in the mall Starbucks with the Wall Street Journal. I never read the Wall Street Journal unless I’m hunkered down in a coffee shop.
Anyway, after doing the crossword puzzle, I started reading the articles. I came across an article entitled EU, Canada Near Free-Trade Pact After Farm Deal (the pact has since been approved). I wasn’t really reading the article, but there was an associated graphic, which featured pie charts. There were four of them, and Tufte likes multiple pies even less tahn he likes a single pie, so I looked a little closer to see if there was any fodder for a Chart Busters post.
Well, despite the multitude of pie charts, the pies were innocuous enough. The data they contained, however, caused me to scratch my head.
I’ll let you examine the graphic for a minute or two, so you have a chance to find what caught my eye.
Find it yet?
The charts show imports and exports in 2012 between Canada and the European Union, in billions of euros. But there are discrepancies. The imports from the EU (€43.3) don’t match the exports to Canada (€31.3), and the exports to the EU (€30.1) don’t match the imports from Canada (€30.5).
Shouldn’t these numbers match up? Or am I missing something?