<p>Actually, US News does publish a separate ranking of "top public universities":</p>
<p>USNews.com:</a> America's Best Colleges 2008: National Universities: Top Publics</p>
<p>It produces the usual suspects: Cal-Berkeley #1, Virginia #2, Michigan and UCLA tied for #3, UNC-Chapel Hill #5, William & Mary #6, Georgia Tech #7, Wisconsin-Madison, UIUC, and UC-San Diego tied for #8, and so on. But as best I can tell, this just plucks the publics from the standard USN "top national universities" ranking, and lists them separately. </p>
<p>To my mind, comparing publics against both other publics and, separately, against a larger group that combines publics and privates is a somewhat useful exercise, notwithstanding all the particular problems in USN's methodology. Most publics consider other publics their peers, but the top publics also consider the top privates another relevant peer group. From the schools' point of view, it's helpful to see where they stack up against each group. </p>
<p>From the applicant's point of view I think it can also be useful. It's probably true that not all that many applicants will apply only to publics and include in that group publics in other states. But a great many applicants will apply to multiple publics in their own state, and many of those will apply ONLY to publics in their state. It's helpful to a Michigan resident, for example, to know that even if she doesn't get into Michigan, an extremely strong public university (#3 nationally), she'll still be doing quite well to go to Michigan State, a school that at #29 nationally is significantly stronger than the flagship state school in most states and roughly in the middle of the pack in the Big Ten, a peer group that on the whole stacks up pretty favorably among public universities generally; and that most other Michigan schools don't make the list. It's useful information to a California resident comparing Berkeley, UCLA, UC-San Diego, UC-Davis, UC-Santa Barbara, and UC-Irvine that each of these 6 schools is among the top 15 public universities in the country, so even if he only gets into his #6 choice, UC-Irvine, he's still getting a pretty good educational bargain. It's helpful to residents of Massachusetts to know that their flagship state school, UMass-Amherst, comes out pretty low on the pecking order not only relative to all those prestigious private schools that surround it, but also relative to other flagship state schools---and indeed, to the secondary and tertiary public schools in many other states. It's helpful to the residents of Minnesota and Wisconsin, who enjoy tuition reciprocity, to know that at #29 nationally, the University of Minnesota ranks several notches below the University of Wisconsin-Madison at #8, even though their acceptance rates are almost identical (58% for Wisconsin, 57% for Minnesota)---a difference that to some extent is masked by the general USNews ranking in which neither fares very well against a long list of private schools. And so on. </p>
<p>The question, to my mind, is once we're ranking public universities as a group, do the criteria USNews uses for its overall rankings make sense? One obvious criterion mismatch is alumni giving, which appears to be lowest in the UC system, probably because historically California has been most generous with taxpayer support, and there's a general public expectation that the way you "give" to support higher education, a public service, is through taxation. This, as is frequently pointed out, systematically disadvantages public universities in the general US News rankings, but the problem is particularly glaring when you see UC-Berkeley (14%), UCLA (14%), and Michigan (17%) punished in the rankings for their exceptionally low alumni giving rates even relative to some other public schools, in part because their legislatures have been among the most generous. </p>
<p>Another problematic category, it seems to me, is selectivity. Why should we think selectivity per se is a desirable quality in a state university, given their broad educational mission? Do we really think UConn is a better school than Purdue or Indiana University-Bloomington, even though the two Indiana schools have markedly stronger Peer Assessment scores (3.8 Purdue, 3.7 IU, 3.2 UConn), all three have roughly comparable 25th and 75th percentile SAT scores, and the only discernible categories in which UConn has a clear advantage are a lower acceptance rate (51% for UConn, 85% for Purdue, 80% for IU) and alumni giving? To my mind, this just means the state of Indiana is doing a better job of making more places available to qualified candidates (at least as good as UConn's) at two relatively high quality state universities than is the state of Connecticut; but Connecticut gets rewarded in the USNews rankings for underserving its own population.</p>
<p>Freshmen in top 10% of high school class is another dubious criterion when applied to state schools. At all state schools, most of the students will be in-state, but the strength of the top 10% varies widely not only from school to school, but also from state to state. Some states with strong K-12 educational systems, like Minnesota, Wisconsin and Iowa, regularly rank at or near the top of just about every measure of scholastic achievement at every grade level, extending to average ACT and SAT scores that are well above the national averages; while states with weaker K-12 educational systems like Florida, South Carolina, and Mississippi consistently rank at or near the bottom. It's not unreasonable to expect, then, that students in the top 10% of their class in Minnesota, Iowa, and Wisconsin will be, on average, better prepared than the top 10% in Florida, South Carolina, and Mississippi; and indeed, that some among the second decile in Minnesota, Iowa, and Wisconsin (where as Garrison Keillor says, "All the children are above average") may be comparable to students in the top decile in Florida, South Carolina, and Mississippi. But the USNews ranking arbitrarily uses 10% as the cutoff.</p>
<p>I'm sure there's more. Anyone?</p>