This link has been bookmarked by 7 people . It was first bookmarked on 09 Dec 2008, by Joshua Macy.
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12 Feb 10
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28 Jun 09
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“epidemic” reflects a shared environmental influence, like each newspaper receiving the same press release
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25 Apr 09
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There are (at least) three reasons why happiness is correlated within social networks.
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Interestingly, the same issue of the BMJ contained a very careful article by Ethan Cohen-Cole and Jason Fletcher making precisely this point. They employ a pretty cheeky research strategy: if you want to show that a research design is silly, show that it leads to silly conclusions.
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researchers can too easily draw false conclusions about contagion
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25 Dec 08
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16 Dec 08
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09 Dec 08
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They use Fowler and Christakis’s approach on another dataset, and show that it leads to the unlikely conclusion that height, headaches, and acne are also contagious. The more likely explanation, of course, is that all are subject to similar environmental influences. For instance, the same jackhammer causing your headache is likely causing mine.
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