USPS mail carrier dog bite incidentsUS certified organic farmland
It is a curious fact, and one that most people find out far too late in life, that the number of times a postal worker gets bitten by a dog moves in almost perfect inverse proportion to the acreage of land devoted to growing organic vegetables, which is to say they move together in exactly opposite directions, like a pair of dancers who have fundamentally misunderstood the choreography. One goes up, the other goes down, with the kind of mechanical precision that would make a Swiss watchmaker weep. We have somehow discovered a cosmic rule binding together dog aggression and vegetable certification, which suggests either that the universe has a peculiar sense of humor or that we are very, very good at finding patterns in noise.
The likeliest culprit here is not, as one might hope, that organic farming cures dogs of their postal-worker-attacking ways, but rather that both metrics are probably being dragged along by the same underlying current: the slow, steady migration of Americans away from rural areas toward cities and suburbs. As farmland consolidates and specializes between 2016 and 2021, the number of small hobby farms and rural properties drops, and with it the number of rural dogs trained to view mail carriers as intruders. Meanwhile, certified organic farming, which tends to concentrate on larger operations and premium markets closer to urban centers where people will actually pay eighteen dollars for a tomato, grows more centralized and professional. The USPS, meanwhile, found itself delivering to increasingly suburban and urban routes where dogs are fewer but angrier. We're talking about something like 40 million acres of farmland vanishing in a single generation.
What we have stumbled upon here is not evidence of any causal relationship whatsoever, but rather a reminder that correlation this perfect is less a window into truth and more a kind of statistical mirror, reflecting back whatever pattern-seeking story we wanted to tell ourselves in the first place. The dog bite data and the organic acreage are probably both just passengers on the same larger wave of economic and demographic change, which makes them about as causally connected as rainfall in Minnesota and the price of tea in Beijing. Or perhaps they are simply two things that happened to move the same direction for six years, which is precisely the kind of thing that happens constantly.
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Want to learn more about why correlations like “USPS mail carrier dog bite incidents” vs “US certified organic farmland” don't prove causation? Read our guide to statistical thinking.