So ESPN's prestige rankings came out and Michigan barely cracks the top 10. They use a bunch of different numbers and criteria. To determine prestige, a seemingly intangible concept, on hard numbers seems unreliable to begin with BUT any method which reduces Michigan's national title count from 11 to 2(?!) seems flawed.
This question was addressed in a chat wrap with one of the researchers:
Bill (Detroit, Mi): Ummmm you say U of M has 2 national championships. Can you count to 11??? 1901, 1902, 1903, 1904, 1918, 1923, 1932, 1933, 1947, 1948, 1997
SportsNation Harold Shelton : You are a funny guy Bill. We can play this game too. Can you read where the study says "SINCE 1936?" Or how about the fact that we only used the AP or the UPI/Coaches/BCS Poll. Michigan didn't win a title under those polls in 1947.
I'm not sure if their national title counting system hurt any other program as much as it did Michigan but it would seem that any system which reduces your titles from 11 to 2 is a flawed system. Of course this assumes the other nine titles weren't based on votes by The National Association of Waffle Makers or Bob's Pelt and Hide, but I assume Michigan claims 11 National Titles b/c they all were given by some nationally recognizable organizations.