“…Cascio (2009aCascio ( , 2009b, Conley and Glauber (2006), Fitzpatrick (2008), Hauser, Pager, and Simmons (2004), Oreopoulos, Page, and Stevens (2006), Page (2007), Roderick (1994), Rose, Medway, Cantrell, and Marus (1983), and Shepard and Smith (1989) all used this proxy as a measure of educational achievement.…”