They do give a brief summary: "the staff at CCAP gathers data from a variety of sources. They use 11 factors in compiling these rankings, each of which falls into one of five general categories. First, they measure how much graduates succeed in their chosen professions after they leave school, evaluating the average salaries of graduates reported by
Payscale.com (30%), the number of alumni listed in a Forbes/CCAP list of corporate officers (5%), and enrollment-adjusted entries in Who's Who in America (10%).
Next they measure how satisfied students are with their college experience, examining freshman-to-sophomore retention rates (5%) and student evaluations of classes on the websites
RateMyProfessors.com (17.5%) and
MyPlan.com (5%). They look at how much debt students rack up over their college careers, considering the four-year debt load for a typical student borrower (12.5%), and the overall student loan default rate (5%). They evaluate how many students actually finish their degrees in four years, considering both the actual graduation rate (8.75%) and the gap between the average rate and a predicted rate, based on characteristics of the school (8.75%). "
I think the source for some of these stats is IPEDS - basically, the Federal Gov't Educational data reporting group.
I don't think I could ever make it clear my dislike for these rankings. I hate them.