<p>^Didn’t know it was that far back. In that case the '07 and '08 numbers make even more sense. </p>
<p>Pton kids are locked in, Yale ones are not, and so more probably applied to Stanford regular (or S SCEA admits applied to Yale regular). Once P dropped ED, the number of P-aspiring applicants who applied to S increased significantly if S was preferred to Y (as it was in my case). The numbers seem to follow.</p>