Other studies used completely unscientific methods (starting with VERY small sample size, also, extending the definition to include sexual assault, which could be verbal abuse, or anything really).<p>Relevant quote:<p>&quot;The one-in-five estimate, on the other hand, comes from the federally funded Campus Sexual Assault Study (CSA), a 2006 web survey of more than 5,000 women and 1,000 men attending two unnamed, large public universities.<p>As Yoffe points out, two campuses is an awfully small sample.<p>Christopher Krebs, a senior researcher at a non-profit research group, RTI International, who led the Campus Sexual Assault Study, acknowledges that. “The one-in-five statistic is not anything we trotted out as a national statistic,” he says. “But it has certainly been used in that way” — most prominently by President Obama. &quot;<p><a href="https:&#x2F;&#x2F;www.themarshallproject.org&#x2F;2014&#x2F;12&#x2F;11&#x2F;the-dueling-data-on-campus-rape#.uNmrZiIyb" rel="nofollow">https:&#x2F;&#x2F;www.themarshallproject.org&#x2F;2014&#x2F;12&#x2F;11&#x2F;the-dueling-da...</a>