How U.S. News Calculates the College Rankings
National Univeersity Methodology
How U.S. News Calculates the College Rankings - US News and World Report
"rankings allow you to compare at a glance the relative quality of institutions based on such widely accepted indicators of excellence as freshman retention and graduation rates and the strength of the faculty. And as you check out the data for colleges already on your short list, you may discover unfamiliar schools with similar metrics, and thus broaden your options. Yes, many factors other than those spotlighted here will figure in your decision, including location and the feel of campus life; the range of academic offerings, activities, and sports; and cost and the availability of financial aid. But if you combine the information on this site with college visits, interviews, and your own intuition, our rankings can be a powerful tool in your quest for the right college."
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Several of top ranked schools noted above contain well respected and excellent healthcare, medical and nursing informatics masters programs. There are also several excellent Informatics Masters programs that are not listed. I'd say go by a combo of the university as a whole's reputation, the reputation of the informatics masters program and your own ranking criteria.
Examples: Northwestern University of Chicago has an excellent and world renowned reputation, although not an "Ivy League" school (criteria that some would include and others would not include in ranking it) it too has a medical informatics program , although not one I would choose as the program is too new for my taste and IMHO is not multi-disciplinary enough. I also know a few folks who have completed it's program and have not been able to find a job as the course work may not also be real-world enough. But those are some of my personal criteria for "ranking" a program.
Here is another one Duke- excellent school, excellent nursing informatics program but too expensive for my blood and definately not worth the ROI.
Would someone hire a Duke informatics grad over a Northwestern one? I seriously doubt it. That may be why you cant base your entire decision on selecting an informatics program on outside source ranking criteria but instead on a combo of that and your own criteria. After you insure that the program is accredited by the appropriate higher regional and national education bodies the rest is up to you.