“Yes, of course there are limits, but those limits can be pretty high. Penn, for example, fills about half its class ED. Their overall yield in 2016 was 67.4% (3,674 admitted, 2,491 enrolled). I’m sure they don’t get 100% yield on ED admits, but it’s probably something close to that.”
Sure Penn, Duke, Northwestern fill half their seats through ED, which improves their yield (and also admit rate stats). But to deploy ED in this way, you need to find very high quality students who are willing to ED to your school. University of Whatev can’t do that. It only works for schools that are pretty strong who want to get stronger. And the really really strong (HYPS) achieve even higher yields without using the ED tool.
End of the day, USNWR does it the right way. They come up with a multi-factor formula with various weightings that measures financial resources, student selectivity, graduation rates, student test scores, peer surveys, counselor surveys, etc. etc. etc. Overlaying all of those metrics eliminates the outliers (BYU’s high yield) and also minimizes the gaming (although gaming still happens). Hard to do better than what they do.
But if you want one single metric instead, I’ve not seen anyone point to anything better than YTAR. It produces a list that most would agree with. Because it measures the things that most would see as elite indicators.
Schools that people wish they could go to, that are very hard to get into, and schools that people rarely turn down if admitted. As Groucho says, the clubs you want to belong to but won’t have you as a member.
The YTAR list also correlates highly with many of the other metrics that have been mentioned – test scores, endowment per student, need blind/full need, high full pay percentage. Elite schools are the total package.