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AdjO — This is an abbreviation for adjusted offensive efficiency. This is adjusted offensive points per drive multiplied by ten.
AdjD — This is an abbreviation for adjusted defensive efficiency. This is adjusted defensive points per drive multiplied by ten.
Available Yds — This is an abbreviation for available yards at the start of a drive. If a team starts on its own 20, there were 80 available yards on that particular drive.
Drive — Any possession with an offensive play is considered a drive. All drives have nine possible outcomes. Its formula is scoring drives + punts + missed field goals + turnovers + time-expiring drives.
End — The average number of yards a team is from the end zone when their drive ends. The formula for this is (available yards - yards gained) / drives.
eTO% — Effective turnover percentage; eTO% includes safeties that occurred on offensive plays and failed fourth down conversions. Its formula is (loss of downs + fumbles lost + interceptions + safeties) / drives. This formula counts failed fourth down conversions and safeties as turnovers because the offense’s intent was to retain possession.
FUM% — Fumble percentage; its formula is fumbles / drives.
INT% — Interception percentage; its formula is interceptions / drives.
Margin — The listed margin on a drive chart is simply the home team’s score - the away team’s score.
OppO — This is an abbreviation for the strength of the opposing offense.
OppD — This is an abbreviation for the strength of the opposing defense.
Pts/Dr — Points per drive; its formula is ((FG × 3) + (TD × 7)) / drives.
Punt% — Punt percentage; the formula for Punt% is punts / drives.
Pyth — This is an abbreviation for Pythagorean Expectation. It was developed by Bill James. In baseball, the purpose of this formula is to estimate the number of games a team should have won based on runs scored and runs allowed. Its formula for football is (adjusted offense ^ 2) / ((adjusted offense ^ 2) + (adjusted defense ^ 2)).
Score% — Score percentage; its formula is (TD + FG) / drives.
SOS — This abbreviation is for strength of schedule. It also uses the Pythagorean Expectation formula. Its formula is (opponent offense ^ 2) / ((opponent offense ^ 2) + (opponent defense ^ 2)).
Start — The average number of yards a team is from the end zone when their drive begins. The formula for this is available yards / drives.
Statistically Significant Drives — Drives that take place when a game is close. Football Outsiders’ criteria for a statistically significant drive is used to determine which drives are statistically significant. Here is the definition of a statistically drive:
- Drives beginning in the first quarter with a margin of 28 points or less.
- Drives beginning in the second quarter with a margin of 24 points or less.
- Drives beginning in the third quarter with a margin of 21 points or less.
- Drives beginning in the fourth quarter with a margin of 16 points or less.
- Drives beginning in the final two minutes of a game with a scoring margin of 8 points or less.
- This criteria has been added on this site because it's extremely difficult for a team to overcome a two possession deficit with under two minutes remaining. This means a team must score at least one touchdown, recover an onside kick, and make a field goal or score another touchdown in two minutes or less.
Time-expiring drives are filtered with the following criteria:
- All drives that have a quarterback kneel are discarded. It doesn't matter what plays preceded the quarterback kneel.
- Time-expiring drives with at least three consecutive running plays to end a half are a discarded.
- If a team passes on a time-expiring drive where no knee is taken, this must count as statistically significant because the available information indicates that an offense attempted to score.
- If a team is sacked on a time-expiring drive where no knee is taken, that also must count as a statistically significant drive.
TD% — Touchdown percentage; the formula for TD% is touchdowns / drives.
TO% — Turnover percentage; the formula for TO% is (interceptions + fumbles lost) / drives.
Yds% — Yardage percentage; the formula for this is yards gained / yards available.
Yds/Dr — Yards per drive; its formula is yards / drives.