<p>the previous poster is correct. and according to our resident statistician byerly, princeton's ratio of undergraduate students to strictly GRADUATE students in the arts and sciences is substantially the same as the ratios at harvard and yale. what princeton doesn't have, that harvard and yale do, are the thousands and thousands of PROFESSIONAL students (business, law, medicine, etc.). as a result, its ratio of undergrads to grad PLUS professional students is much more "favorable" (for undergrads) - something like 2.5/1 at princeton, versus 1/1 at yale and 1/2 at harvard. so, similar amount of graduate research as HY, but with greater undergraduate focus, at least numerically.</p>
<p>as for the quality of princeton's graduate programs, see:</p>