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Surveys of opin…
October 16, 2013, 7:35 pm
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Surveys of opinions, of the prevalence of disease, of habits or of environmental exposures may be informative, but they are not science in the same way that causal studies about how nature operates are science.

Ken Rothman, JE Gallacher, and EE Hatch in “Why representativeness should be avoided” Int J Epidemiology (2013) 42(4): 1012-1014