Seed Quest

History has shown that to get a number one seed in the NCAA tournament, you not only have to defeat quality opponents, you can't lose to them very often either. It's often crowded at the top and each loss is another chink in the armor that will be picked apart come tourney time. With that said, I am trying to study the "art" of how teams make it to that number one line. Each team belongs in a tier according to the number of losses they have accumulated. I want to eventually find out, after going through previous years' seedings, just how many losses it takes to be removed from consideration.
Here are the current tiers for this season, results of 01/20/07

0 Losses

1 Loss
Wisconsin (19-1)
Oregon (18-1)
UCLA (17-1)

2 Losses
Air Force (18-2)
Clemson (18-2)
UNC (17-2)
Florida (17-2)
Pitt (17-2)
Butler (17-2)
Nevada (17-2)
TX A&M (16-2)

3 Losses
Duke (16-3)
Ohio State (16-3)
WA State (16-3)
Kansas (16-3)
OK State (16-3)
VCU (16-3)
Memphis (15-3)
Notre Dame (15-3)
Alabama (15-3)