Selectivity, Yield etc are just a few numbers which are fun for statisticians, but are of little value to applicants. There are just so many factors that can effect selectivity and yield that basing any of your judgement on these numbers is highly inaccurate.
It's obvious to want to find out the least selective ultra-elite or elite schools and then only applying there to increase the chances of selection (Not saying that this is what the OP intended). But the thing is that if you are a great candidate for a school which adores quant, then you'll have a better chance of getting selected in that school than a slightly less-selective but entrepreneurship focussed school where you don't fit.
In BW, random people mentioned Chicago GSB's selectivity as somewhere between 20-35 %. Darden has a selectivity of 46% or so. Does that mean that you'll have better chances of getting into these schools than in, say, Columbia (Which has a selectivity of around 18%)? Absolutely not !! Does that mean that you'll get better quality people at Columbia? Again, absolutely not !!
Selectivity number means as much to a school's reputation as my GMAT score means to my application .. i.e. close to zilch !! (This is something that I realized AFTER getting a great score)