I know that this is one of those issues around here :) but this piece on Slate today on the recent new survey is just really good and worth the read when it comes to stats and surveys
http://www.slate.com/articles/double_x/doublex/2015/09/aau_campus_sexual_assault_survey_why_such_surveys_don_t_paint_an_accurate.html
From the article:
"This week, I spoke to David Cantor, co-principal investigator of the AAU study. He explained that the 27 campuses he and his colleagues looked at are not nationally representative; the set of schools was relatively large, but it was not randomly selected from the full complement of American universities. While 150,000 students filled out the survey, it was offered to almost 780,000 students, which makes for a disappointingly low response rate of around 19 percent. That, too, is a problem, Cantor said, because it raises questions as to whether those students who did take the survey were more inclined to have been victims of sexual assault, thus inflating the results. He said there is evidence this is the case, explaining that analysis of the survey turned up “some indication that people who did not respond were less likely to be victims.”
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