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Correlation or causation – The daily blog of behavioral and cognitive economics

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Correlation or causation – The daily blog of behavioral and cognitive economics

How a Pizza Pie Chart Can Be Misleading

The Washington Post tells us that pizza deliveries could “predict military action.” As an example of a correlation, it is about more than food. Using Google Maps data, the Pentagon Pizza Report monitors Defense Department pie deliveries. On June 12, at 7 p.m., they cited a spike in activity: That same evening, soon after, the U.S. attack on Iranian nuclear sites began. Sometimes called the Pizza Index by its advocates, there was an uptick in Pentagon pie deliveries before Operation Desert Storm during 1991. An Economist magazine data journalist even implied that “pie charts” were useful. Others though remind us that delivery options have multiplied since the 1990s. ….[READ]

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