<p>I would hesitate to equate the acceptance rate for an institution with how "good" it is - certainly, it's one criteria one can use to talk about how selective a school is, but I don't think it's necessarily the best barometer of which school is "better."</p>
<p>Taking your example of Middlebury, if you look at their common data set found here: <a href="http://www.middlebury.edu/NR/rdonlyres/38CD6DF6-9AE0-4D6E-829B-BB56151DA0F0/0/CDS2008_2009.pdf%5B/url%5D">http://www.middlebury.edu/NR/rdonlyres/38CD6DF6-9AE0-4D6E-829B-BB56151DA0F0/0/CDS2008_2009.pdf</a> you'll note that about 4500 women applied to Middlebury, 660 were accepted, and 290 eventually chose to come. The numbers are comparable for male applicants, though there were about 1000 fewer applications. In other words, Middlebury's incoming freshman class was about 570, with an almost even split of 50/50 female to male ratio.</p>
<p>Then look at Wellesley. If you look at their latest available common data set <a href="http://www.wellesley.edu/InstResearch/Common%20Data%20Set%202007.pdf%5B/url%5D">http://www.wellesley.edu/InstResearch/Common%20Data%20Set%202007.pdf</a> , you'll see that they had a similar size incoming class of 590, but they're all women. In other words, Wellesley and other women's colleges are drawing on just half of the population for applications. All spots in the class can only be filled by women. If Wellesley were to go co-ed (god forbid!!!), would application numbers go up? I bet my bottom dollar it would. Would the acceptance rate go down? I'm sure it would, as I don't think Wellesley has any plans to do a major expansion of facilities to accommodate huge numbers of students.</p>
<p>In other words, acceptance rates, I believe, are an imperfect method to rely upon to say which school is "better" than another. Certainly, comparing the acceptance rates of single-sex schools vs. co-ed schools is like comparing the proverbial apples vs. oranges. </p>
<p>As for Barnard, their most recent common data set: <a href="http://www.barnard.edu/opir/CDS2007_2008.pdf%5B/url%5D">http://www.barnard.edu/opir/CDS2007_2008.pdf</a> shows they received about 500 more applications than Wellesley, accepted about 100 few applicants, and ended up with a slightly smaller class. Personally, I believe that the academics at the Sister schools are very comparable to one another and it's not about which Sister school is "better" than the other, but which one is a better fit for you. </p>
<p>As a side note, check out the common data sets for the schools that you're interested in. It's an awesome time killer and you can see loads of detailed info such as average per-borrower cumulative undergraduate indebtedness (Barnard: $17,630, Middlebury: $19,981, Wellesley: $10,376), freshmen retention rate (Barnard: 95%, Middlebury: 95%, Wellesley: 96%), six year graduation rate for 2001 cohort (Barnard: 89%, Middlebury: 91%, Wellesley: 92%), and so on and so forth. If you like numbers, this is your goldmine.</p>
<p>Go the school's website, and do a search for "common data set." That usually does the trick. If not, check out a school's institutional research department.</p>