<p>Alexandre,
I share some of your concerns about the comparisons of public universities vs privates, but mostly because of the typically much larger size, their typically more limited faculty & financial resources and their certainly different mandate/responsibility to the citizens of their states. These differences can lead to some good things (among other things, likely broader assortment of areas of study occur with larger size) and some bad things (among other things, lower overall student quality, larger class sizes). </p>
<p>I go back and forth on the issue of whether publics and privates should be ranked together. One danger with separate rankings would be the potential message that public schools are inferior to privates and can’t compete. But the way that the USNWR now does its rankings, some statistics clearly work to the benefit of publics (high weight assigned to top 10%, low weight to acceptance rate, very high weight to PA scores) while others are negative and not particularly relevant (Alumni Giving). </p>
<p>For your comments about SATs and their use by publics and privates, I suspect you are correct that publics assign it less weight, but the privates likewise are not solely guided by this number. For example, U Penn only accepted 26% of those who scored 750 or above on their Critical Reading and only 21% of those who scored 750 or above on the Math section. Thus, they REJECTED 74% of those at this level in CR and 79% in Math. Clearly, if the primary determinant for private school admissions was SAT scores, a highly competitive college like U Penn has ample scope (and probably greater than all publics) for boosting these numbers. </p>
<p>(As an aside re your comments about U Michigan and its SAT policies, you might want to check with hoedown and/or others at the school. My understanding is that, while the admissions policies do not superscore, the reporting on the Common Data Set does and these are the numbers that are reported publicly.)</p>
<p>For the public universities, in terms of selectivity, I did some calculations for 2008 vs 1999 to see if their position relative to one another had changed much. Using the same formula that USNWR now uses to calculate this (50% SAT scores, 40% Top 10%, 10% Acceptance Rate), here are the results:</p>
<p>1999
1. UC Berkeley (score of .99)
2. UCLA (.96)
3. U Virginia (.91)
4. U North Carolina (.82)
5. U Michigan (.77)</p>
<p>2008
1. UC Berkeley (score of 1.00)
2. UCLA (.97)
3. U Virginia (.92)
4. U Michigan (.91)
5. U North Carolina (.87)</p>
<p>Based on this, one can see that the numbers and order change only marginally for most of the schools, but U Michigan is the exception as it made large statistical gains over the last ten years. (Note: My calculations differ slightly from USNWR as the benchmark in each category was the leading public and thus the measurements were made against that rather than against the top university (Harvard) for selectivity.) Congratulations to U Michigan.</p>