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by yummyfajitas
4929 days ago
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Only because new people entered the country and dragged the median down. http://www.chrisstucchio.com/blog/2011/immigrants_simpsons_p... Consider a nation with Steve (income $50) Bill (income $50) and George (income $100). The median is $50. Now suppose Steve's income remains the same, Bill's goes up to $60, and George's income goes up to $150. The median has gone up to $60, right? However, suppose during this time, Jose (income $30) and Hector (income $40) immigrated. The median is back down to $50 even though every single person saw their income go up. The longitudinal data I link to demonstrates that this is exactly what happened (albeit with different numbers). (Note: this is an argument against drawing conclusions from Simpson's paradox, not an argument against immigration.) |
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