Thought I'd add on to what I posted in this thread yesterday with a more in-depth look at the differences between the teams which beat Nebraska and the teams which Nebraska beat, in terms of how they approached and attacked NU's defense and how successful they were at carrying out their game plan.
Pass Attempts
To reiterate what I said yesterday, teams attempted about 2 fewer passes overall against Nebraska than they did against the rest of their opponents. However, that stat is tilted towards the philosophies adopted by the teams we beat than the teams that beat us (we were 10-4). So those numbers need to be broken down further. From an offensive philosophy standpoint, the teams which Nebraska beat were teams which passed the ball more (30 attempts per game as opposed to 26 attempts per game). Against Nebraska, those teams did only attempted one less pass than normal (30 pass attempts versus 29 pass attempts), whereas the 4 teams which beat us realized that they don't have to pass it and attempted 3.5 fewer passes than normal (26 pass attempts versus 22.5 pass attempts)
Pass Completions
Going into a game with a game plan is one thing, but how successful a team is at executing that game plan is ultimately what will dictate who wins and who losses. Overall, Nebraska's pass defense was very successful at preventing teams from completing passes, as teams averaged about 17 completions per game; but when they came up against NU's secondary, they averaged 13 completions per game. But again, because of the distribution of the teams we won and lost against (we were 10-4), this stat must be looked at further. Those who lost to Nebraska completed about 18 passes per game against their opponents, but could only complete 13 passes against NU's secondary. Those who beat Nebraska completed 1 fewer pass on average, but managed to complete 1 more pass against NU's secondary than the teams who lost to Nebraska (13 pass completions versus 14 pass completions).
Pass Yards per Completions
While there was no overall difference between NU's secondary and opposing teams' secondaries in terms of pass yards allowed per completion (12.43 yards per completion versus 12.47 yards per completion), there were some interesting results with regards to this statistic. First of all, teams who beat Nebraska averaged 1.6 yards mor per completion than teams who Nebraska beat (13.57 yards per completion versus 11.97 yards per completion). However, when up against Nebraska's secondary, those teams who beat NU excelled, averaging 3.56 more yards per completion whereas the teams who lost to NU regressed, averaging 1.37 fewer yards per completion. To compare the two, NU's secondary allowed 6.53 more yards per completion to teams we lost to than teams we defeated (17.13 yards per completion versus 10.6 yards per completion)
Completed Pass Touchdown Percentage
To clarify, this is how frequently a completed pass goes for a touchdown (the stat at the end of the day really matters). Once again, there was no overall difference between how successful teams were at converting completed passes into touchdowns against other teams and against Nebraska (8.51% versus 9.11%). The teams who Nebraska beat were absolute garbage at this statistic, only managing to convert 7.65% of their completed passes into touchdowns. When up against NU's secondary, they became even worse managing to convert just 5.49% of their completed passes into touchdowns. This was definitely helped by the fact that Nebraska didn't allow a passing touchdown in 4 games all of which were victories. Teams victorious against Nebraska during the season converted 10.66% of their completions into touchdowns. When up against NU's secondary, that statistic skyrocketed significantly up to 18.18%. Teams which beat Nebraska converted 12.69% more of their completed passes into touchdowns (18.18% versus 5.49%).
Rushing Attempts per Game
Now we're going to attack another area which people seemed to think has had an effect on our passing defense, our rushing defense, which was perceived as terrible throughout the year. Teams attempted roughly the same number of rushes against Nebraska as they did the rest of their opponents (39.57 attempts per game versus 40.43 attempts per game). However, those who beat Nebraska ran the ball 8 times more per game than those who lost to Nebraska (45.63 attempts per game versus 37.75 attempts per game). Teams who beat Nebraska were more inclined to run, and while those teams who lost to Nebraska didn't run the ball more than they normally did, these teams ran the ball 5 times more per game against NU than against the rest of their schedule (43.25 attempts per game versus 48 attempts per game).
Rushing Yards per Carry
Nebraska allowed just .10 yards per carry more than their opponents' seasonal averages (4.35 yards per carry versus 4.45 yards per carry). Teams who beat Nebraska were more successful at running the ball overall than teams that were defeated by Nebraska (4.95 yards per carry versus 4.11 yards per carry). Against Nebraska, teams who eventually lost saw a drop of .77 yards per carry from 4.11 yards per carry to 3.34 yards per carry. Against Nebraska, teams who eventually won saw an increase of 2.28 yards per carry from 4.95 yards per carry to 7.23 yards per carry. When up against Nebraska's run defense, teams that won had twice the amount of yards per carry than teams that lost (7.23 yards per carry versus 3.34 yards per carry).
Rushes to Touchdowns Percentage
Like its passing counterpart, rushes to touchdowns is the frequency of how often a team, when they run it, score a touchdown. Overall, Nebraska allowed teams to convert just .28% less rushes into touchdowns than the rest of their opponents' opponents. Teams which beat Nebraska were better at converting rushing attempts into touchdowns (5.96% versus 4.09%). Teams which lost to Nebraska saw a decrease in that conversion rate from 4.09% to 2.96%. However, teams which beat Nebraska saw an increase in this conversion rate from 5.96% to 7.78%.
Conclusions
Nebraska's defense in 2012 wasn't up to the caliber of defenses which have been fielded in the past, even as recent as in Pelini's tenure (2009 and 2010). However, it wasn't as bad as a lot of fans made it out to be. Losses tend to stick in the mind and memory more so than wins, so while it is understandable, it is wrong. Nebraska's defense in 2012 was good more times than it was bad, as the 10 teams we beat were held under their normal pass yards per completion, pass to touchdown percentage, rushing yards per carry, and rush attempts to touchdown percentage statistics. That being said, when a leak started in Nebraska's defense, the whole dam burst in a matter of seconds; teams who were victorious against Nebraska saw a dramatic increase in pass yards per completion, pass to touchdown percentage, rush yards per carry, and rush to touchdown percentage. Furthermore, it appears that the teams who were successful against Nebraska picked up on the fact that the way to attack Nebraska is through the running game, not the passing game. These teams had nearly 5 more rushes per game against NU as well as nearly 4 less passes per game against NU.