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<p>This is comparing tippy-top publics with the one T20 university that most resembles a public university (and is in fact a hybrid of public-private). Below is a broader (though slightly outdated) comparison of public v. private class sizes at top ~50 universities.</p>
<p>
Index , Class Size Score , National University , USN Teaching Excellence , < 20 (3 points) , 20 - 50 (2 points) , > 50 (1 point)</p>
<p>100% , 2.68 , Harvard , YES , 75% , 17% , 9%
100% , 2.68 , Columbia , no , 76% , 16% , 8%
100% , 2.68 , U Chicago , YES , 72% , 24% , 4%
100% , 2.68 , Tufts , YES , 74% , 21% , 4%
100% , 2.67 , Yale , YES , 75% , 17% , 8%
100% , 2.67 , U Penn , no , 74% , 19% , 7%
99% , 2.66 , Northwestern , YES , 75% , 17% , 7%
99% , 2.65 , Stanford , YES , 74% , 16% , 11%
99% , 2.65 , Duke , YES , 70% , 25% , 5%
98% , 2.63 , Princeton , YES , 73% , 17% , 10%
97% , 2.61 , Caltech , YES , 69% , 23% , 8%
97% , 2.61 , Wash U , YES , 72% , 18% , 9%
97% , 2.61 , Rice , YES , 68% , 25% , 7%
97% , 2.61 , Vanderbilt , YES , 67% , 27% , 6%
97% , 2.6 , Emory , YES , 68% , 25% , 6%
97% , 2.59 , Brown , YES , 70% , 20% , 9%
96% , 2.58 , Brandeis , no , 66% , 27% , 6%
96% , 2.56 , Carnegie Mellon , no , 65% , 26% , 9%
95% , 2.55 , Dartmouth , YES , 64% , 27% , 9%
95% , 2.55 , Wake Forest , YES , 57% , 41% , 2%
95% , 2.54 , Johns Hopkins , no , 65% , 24% , 11%
95% , 2.54 , Tulane , no , 62% , 30% , 8%
94% , 2.52 , USC , no , 64% , 24% , 12%
94% , 2.52 , Case Western , no , 62% , 28% , 10%
93% , 2.5 , MIT , no , 64% , 23% , 12%
93% , 2.5 , U Rochester , no , 62% , 26% , 12%
93% , 2.49 , Georgetown , YES , 58% , 34% , 7%
**93% , 2.48 , UC Berkeley , no , 62% , 24% , 14% <--- TOP PUBLIC**
92% , 2.46 , Notre Dame , YES , 56% , 34% , 10%
92% , 2.46 , NYU , no , 58% , 30% , 12%
91% , 2.44 , W&M , YES , 49% , 45% , 7%
91% , 2.43 , Cornell , no , 60% , 23% , 17%
91% , 2.43 , Rensselaer , no , 53% , 37% , 10%
90% , 2.41 , Boston Coll , YES , 48% , 45% , 7%
88% , 2.37 , Lehigh , no , 47% , 43% , 10% <--- BOTTOM PRIVATE
88% , 2.35 , U Virginia , YES , 49% , 37% , 14%
87% , 2.33 , UC Santa Barbara , no , 50% , 33% , 17%
87% , 2.32 , U North Carolina , YES , 44% , 44% , 12%
86% , 2.31 , UCLA , no , 53% , 26% , 20%
86% , 2.31 , UC Irvine , no , 49% , 34% , 16%
85% , 2.28 , U Wisconsin , no , 44% , 39% , 18%
84% , 2.26 , U Michigan , no , 44% , 38% , 18%
82% , 2.21 , U Florida , no , 41% , 39% , 20%
82% , 2.2 , U Washington , no , 35% , 49% , 17%
82% , 2.19 , U Illinois , no , 38% , 43% , 19%
81% , 2.18 , Georgia Tech , no , 40% , 38% , 22%
81% , 2.16 , Penn State , no , 33% , 50% , 17%
80% , 2.14 , UCSD , no , 44% , 26% , 30%
79% , 2.12 , U Texas , no , 35% , 42% , 23%
78% , 2.09 , UC Davis , no , 35% , 38% , 28%
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<p>Source: <a href=“http://talk.collegeconfidential.com/college-search-selection/708190-avg-class-size-4.html[/url]”>http://talk.collegeconfidential.com/college-search-selection/708190-avg-class-size-4.html</a>, post #50, dated 05-08-2009.</p>
<p>I think these figures even understate the public v. private differences for typical undergraduates. Large state universities, especially the leading flagships, offer (to their great credit) a very large number of upper-division (undergraduate-graduate) classes in diverse fields. These have far lower enrollments than required introductory classes or classes in the most popular majors. Therefore, they will tend to deflate the overall class size numbers. Honors programs presumably do lower the average class sizes for some 1st and 2nd year students.</p>
<p>These numbers do not capture other important differences such as the number of writing assignments, the use of essay v. multiple choice exam formats, the amount of classroom discussion, or the use of original/primary source teaching materials v. commercial textbooks. Class size numbers are rough proxies for these distinctions. My S2 visited one public honors college where the classes were indeed fairly small (~25), but the prevailing instructional style still seemed to be a lecture format where the professor occasionally tossed out softball questions to the students. YMMV, I suppose.</p>