Those data are two years old (and the schools incomplete), but still helpful directionally speaking. IMO the bigger issue with EA is that at some schools certain majors will substantially or completely fill up (Engineering/business/CS at UIUC, engineering at Purdue) and/or merit aid is greater in early rounds and diminishes in RD (harder to get data because schools are often not transparent about this, but this is true at Purdue and Tulane).
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