Next, we can measure the difference between each defense's expected WPA and his actual WPA. This difference could be considered clutchitude. The graph below illustrates this concept. The vertical red line is the difference between the WPA and the expected WPA of a very un-clutch defense this season--the Carolina Panthers.
Note that this is not a claim that 'clutch' is a permanent or reliable quality of any team or player. It is only a recognition that some squads have performed better or worse in high leverage situations than they have in other situations so far this season. We might expect the squads at the top of the list to regress toward the mean over the remainder of the season. In other words, they might be considered as 'over-performing.' Likewise, the squads at the bottom of the list might be expected to regress upward. For example, the Jets' #27 ranking does not imply they do not play well under pressure. It only means that their best play has tended to be in low-leverage situations to date.
These numbers are through Sunday afternoon of week 8. Keep in mind negative WPA and EPA numbers are good. On this list, a Positive 'clutch' number means the squad has won more than expected--that is, the team has tended to over-perform in high-leverage situations.