Yale=Harvard?

<p>Lol, I know my ambiguous title probably got everyone riled up for a "Harvard/Yale is better than Yale/Harvard debate" but I promise that wasn't what I intended! I was just wondering, does anybody know if there is a high correlation between getting a Yale acceptance and getting a Harvard acceptance? I know that there must be some correlation (given that acceptances to one school must be strong even in relation to the applicant pool of the other school) but I've noticed (strictly through anecdotes, and my GC swears by this) that Harvard and Yale correlate more than say Yale and Stanford or Princeton and Harvard, so what do you guys think about this? Is it true? It might make sense because Harvard and Yale's apps have the exact same essays...(almost)</p>