I have finally updated the Differential Analysis spreadsheet for this week.
As you might expect, Ohio State is now number one in the country in several categories.
While the NCAA simply adds up numbers, I have eliminated all games against non FBS competition, including all games involving
Reclassifying Provisional Western Kentucky. My rankings are therefore slightly different than what the NCAA posts, but I believe them to be more useful.
Ohio State's Rankings:
Scoring Defense (SD):____1
Differential SD:_________1
Total Defense (TD):______2
Differential TD:_________1
Rushing Defense (RD):____1
Differential RD:_________1
Passing Defense (PD):___12
Differential PD:_________6
In the above, Differential refers to the proportion of their usual yards (and points) that opponents get when they play you. For example, OSU's Differential Scoring Defense (DSD) is 0.235; so OSU's opponents get, on average, 0.235 times as many points as they get against anyone else they play. The number two team in DSD is LSU, who allow their opponents 0.323 times as many points as they average against anyone else. The 2006 Buckeyes had a DSD of 0.510.
For these purposes, opponents games against you are factored out of their average when doing the comparison. This method requires a great deal more calculation, but offers more valid results (and the spreadsheet is the one doing all the calculating, so it doesn't take any more time).