<p>What causes the split of 3a and 3b; and the comparison you made was Tufts, William and Mary, Wake forest for group 3 and Ohio state for group 4, so that still leaves the question of what causes such a disparity between groupings? </p>
<p>And, of course, what do you feel places 3a and 3b at around Tufts, William and Mary, etc. rather than somewhere higher up?</p>