Glossary

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.

Av. Yards — 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.

FGM — This is an abbreviation for a made field goal.

FUM% — Fumble percentage; its formula is fumbles ÷ drives.

INT% — Interception percentage; its formula is interceptions ÷ drives.

MFG — This is an abbreviation for a missed field goal.

Mgn. — This is an abbreviation for scoring 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 (AdjO ^ 2.37) ÷ {(AdjO ^ 2.37) + (AdjD ^ 2.37)}.

SAF — This is an abbreviation for a drive ending in a safety. Safeties that occur off of punt blocks are not counted as safeties because they are not offensive plays. 

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 (OppO ^ 2.37) ÷ {(OppO ^ 2.37) + (OppO ^ 2.37)}.

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 statistical significance effectively filters relevant offensive and defensive drives.. Here is the definition of a statistically significant 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 criterion 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 occur when an offensive possession ends because there was not enough time at the end of a half to run a play. These 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. The one exception to this rule occurs when a team take a knee in the middle of the field to put its place kicker in a more advantageous position to make a field goal.
  • 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.

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