A note on methodology: 4-year colleges and universities.

There are two primary goals to our methodology. First, we considered no single category to be more important than any other. Second, the final rankings needed to reflect excellence across the full breadth of our measures, rather than reward an exceptionally high focus on, say, research. Thus, all three main categories were weighted equally when calculating the final score. In order to ensure that each measurement contributed equally to a school's score within any given category, we standardized each data set so that each had a mean of zero and a standard deviation of one. The data were also adjusted to account for statistical outliers. No school's performance in any single area was allowed to exceed five standard deviations from the mean of the data set. Thanks to rounding, some schools have the same overall score. We have ranked them according to their pre-rounding results.

Each of our three categories includes several components. We have determined the community service score by measuring each school's performance in five different areas: the size of each school's Air Force, Army, and Navy Reserve Officer Training Corps programs, relative to the size of the school; the number of alumni currently serving in the Peace Corps, relative to the size of the school; the percentage of federal work-study grant money spent on community service projects; a combined score based on the number of students participating in community service and total service hours performed, both relative to school size; and a combined score based on the number of full-time staff supporting community service, relative to the total number of staff, the number of academic courses that incorporate service, relative to school size, and whether the institution provides scholarships for community service.

The latter two measures are based on data reported to the Corporation for National and Community Service by colleges and universities in their applications for the President's Higher Education Community Service Honor Roll. The first is a measure of student participation in community service and the second is a measure of institutional support for service. Colleges that did not submit applications had no data and were given zeros on these measures. Many of the schools that dropped in our service rankings this year completed an application in 2009 and therefore received credit in last year's rankings, but did not submit an application in 2010 and therefore did not receive...