<p>truazn8948532, there is no evidence that Penn "yield protects", other than its use of ED, which is comparable to that of several other Ivies (actually identitcal to Princeton's, which of course will end this coming year). Penn's RD yield is about 50%--comparable to other Ivies--and would be significantly higher if Penn was "yield protecting" in its RD admissions.</p>
<p>Also, your Penn CAS admit rate estimate is too high. While the Wharton admit rate is lower than the total Penn admit rate of 15.9%, the SEAS and Nursing rates are higher, and the CAS rate tends to be at or below the overall admit rate (i.e., 15.9% or lower).</p>
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In fact, just 10-13 years ago Penn was ranked #15-16 on USNews before it revamped its admissions practices which despite the fact that many consider these changes to be controversial, has done wonders for its prestige.
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10-13 years ago, Penn was actually #11-13:</p>
<p>And it wasn't merely a revamping of admissions practices that contributed to Penn's rise--there was also sigificant investment in the surrounding neighborhood, substantial increases in research funding, rapid growth of endowment, introduction of a college house system and other significant enhancements of undergraduate education, etc.</p>