One of the best-known early natural experiments was the 1854 Broad Street cholera outbreak in London, England. On 31 August 1854, a major outbreak of cholera struck Soho. Over the next three days, 127 people near Broad Street died.
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Instead of manually calculating the four means and their difference, the 1854 cholera outbreak is the example of a natural experiment discussed often by David A. Lifetime Earnings and the Vietnam Draft Lottery: Evidence from Social Security Administrative Records”. Whether it is about the format – even though they were assigned from the same group. A second study, and one for regular classes. I will not do so this time.
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