Here we go : "We review preliminary demographic and outcome data for participants who pay to “ID-verify” their certificates. They are slightly older, more educ

Here we go : "We review preliminary demographic and outcome data for participants who pay to “ID-verify” their certificates. They are slightly older, more educated, more domestic, and less often female than non-verifying participants in the same course." Moreover since they are "more educated" and the paper also mentions that students are in general graduates in a "disproportionate manner", I assume that these people are very likely to be graduates. The paper is here : http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2586847 http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2586847