How We Do the Rankings
Sources, sources. Most of the data come from the colleges—and U.S. News takes pains to ensure their accuracy. This year, 92.4 percent of the schools we surveyed returned information. We obtained missing data from sources such as the American Association of University Professors, the National Collegiate Athletic Association, the Council for Aid to Education, and the U.S. Department of Education's National Center for Education Statistics. Data that did not come from this year's survey are footnoted. Estimates, which are never published by U.S. News, may be used when schools fail to report particular data points. Missing data are reported as N/A in the ranking tables.
The indicators we use to capture academic quality fall into seven categories: assessment by administrators at peer institutions, retention of students, faculty resources, student selectivity, financial resources, alumni giving, and (for national universities and liberal arts colleges) "graduation rate perform ance," the difference between the proportion of students expected to graduate and the proportion who actually do. The indicators include input measures that reflect a school's student body, its fac ulty, and its financial resources, along with outcome measures that signal how well the institution does its job of educating students. Following are detailed descriptions of the indicators used to measure academic quality:
Peer assessment (weighting: 25 percent). The U.S. News ranking formula gives greatest weight to the opinions of those in a position to judge a school's undergraduate academic excellence. The peer assessment survey allows the top academics we consult-presidents, provosts, and deans of admissions-to account for intangibles such as faculty dedication to teaching. Each individual is asked to rate peer schools' academic programs on a scale from 1 (marginal) to 5 (distinguished). Those who don't know enough about a school to evaluate it fairly are asked to mark "don't know." Synovate, an opinion-research firm based near Chicago, collected the data; of the 4,269 people who were sent questionnaires, 51 percent responded.
Retention (20 percent in national universities and liberal arts colleges and 25 percent in master's and baccalaureate colleges). The higher the proportion of freshmen who return to campus the following year and eventually graduate, the better a school is apt to be at offering the classes and services students need to succeed. This measure has two components: six-year graduation rate (80 percent of the retention score) and freshman retention rate (20 percent). The graduation rate indicates the average proportion of a graduating class who earn a degree in six years or less; we consider freshman classes that started from 1997 through 2000. Freshman retention indicates the average proportion of freshmen entering from 2002 through 2005 who returned the following fall.
Faculty resources (20 percent). Research shows that the more satisfied students are about their contact with professors, the more they will learn and the more likely it is they will graduate. We use six factors from the 2006-07 academic year to assess a school's commitment to instruction. Class size has two components: the proportion of classes with fewer than 20 students (30 percent of the faculty resources score) and the proportion with 50 or more students (10 percent of the score). In our model, a school benefits more for having a large proportion of classes with fewer than 20 students and a small proportion of large classes. Faculty salary (35 percent) is the average faculty pay, plus benefits, during the 2005-06 and 2006-07 academic years, adjusted for regional differences in the cost of living (using indexes from the consulting firm Runzheimer International). We also weigh the proportion of professors with the highest degree in their fields (15 percent), the student-faculty ratio (5 percent), and the proportion of faculty who are full time (5 percent).
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