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  2. Passer rating - Wikipedia

    en.wikipedia.org/wiki/Passer_rating

    Passer rating (also known as passing efficiency in college football) is a measure of the performance of passers, primarily quarterbacks, in gridiron football. [1] There are two formulas currently in use: one used by both the National Football League (NFL) and Canadian Football League (CFL), and the other used in NCAA football.

  3. Spike (gridiron football) - Wikipedia

    en.wikipedia.org/wiki/Spike_(gridiron_football)

    A spike can only be legally performed when the passer is under center, performs the spike immediately after the snap in a single continuous movement, and when the game clock is running. Spiking at any other point while the ball is live is always intentional grounding regardless of pressure or location; this is called a delayed spike .

  4. Football Power Index - Wikipedia

    en.wikipedia.org/wiki/Football_Power_Index

    Football Power Index (abbreviated as FPI) is a predictive rating system developed by ESPN that measures team strength and uses it to forecast game and season results in American football. Each team's FPI rating is composed of predictive offensive, defensive, and special teams value, as measured by a function of expected points added (EPA).

  5. Sports rating system - Wikipedia

    en.wikipedia.org/wiki/Sports_rating_system

    When two teams of equal quality play, the team at home tends to win more often. The size of the effect changes based on the era of play, game type, season length, sport, even number of time zones crossed. But across all conditions, "simply playing at home increases the chances of winning."

  6. Strat-O-Matic Football - Wikipedia

    en.wikipedia.org/wiki/Strat-O-Matic_Football

    The game is a statistically based sports game that simulates the play of American football. Each player's statistics are gathered, analyzed, and then converted into numerical results which reflect each player's production for a given year. These numerical results are placed on a set of cards, with each team having its own set.

  7. All-purpose yardage - Wikipedia

    en.wikipedia.org/wiki/All-purpose_yardage

    All-purpose yards or all-purpose yardage is a gridiron football statistical measure. It is virtually the same as the statistic that some football leagues refer to as combined net yards. [1] In the game of football, progress is measured by advancing the football towards the opposing team's goal line.

  8. Expected goals - Wikipedia

    en.wikipedia.org/wiki/Expected_goals

    For each team, the season was split into two halves. Since midseason trades and injuries can have an impact on a team’s performance, we did not use statistics from the first half of the season to predict goals in the second half. Instead, we split the season into odd and even games, and used statistics from odd games to predict goals in even ...

  9. Intentional grounding - Wikipedia

    en.wikipedia.org/wiki/Intentional_grounding

    However, the rules explicitly allow the quarterback to spike the ball immediately after receiving it from the center to stop the clock [a] without using a time out. Intentional grounding is called only if all of the following components are present: Imminent pressure: The passer must face "imminent loss of yardage."