What is IIT? How is it calculated for the NFL?
Injury Impact To Team (IIT) is a single-value metric that attempts to quantify the impact of a player not playing for their team. It weights injured players and their time missed based on their value to their team and the proportion of their teams’ games that they’ve missed.
IIT utilizes a player’s number of games missed due to injury, their past season Approximate Value metric (AV metric as calculated by Pro-Football-Reference.com) and the number of games played by their team.
A higher IIT number equals a greater impact of missing players to the team. A high IIT value for a player reflects a high number of games missed due to injury, a high AV value, or a combination of both. The exact number is not as important as the basic range, versus other players. This is the case with most statistics in the analytics of sport performance.
NFL IIT-av = (Approximate Value x PlayerGamesInjured) / (16 x TeamGamesPlayed)
What injury and IIT calculations do you make for the NFL? What are they?
- Out (Team Reported) – Team reported cumulative count of players who did not play in a game that had been previously reported as probable, questionable, or doubtful.
- IR (Team Reported) – Team reported cumulative count of games missed per player who were listed by a team as being on injured reserve.
- PUP (Team Reported) – Team reported cumulative count of games missed per player reported as physically unable to play by their team.
- SUS (Team Reported) – Team reported cumulative count of games missed by players due to suspension.
- Total Injured – Sum of Out, IR, and PUP counts for a player/team. It excludes games missed by suspended players.
- IIT-avtotal – Sum of IIT-passer, IIT-rushrec, IIT-defense, IIT-kicker for a player or a team
- IIT-passer – IIT calculation for players with at least one pass attempt
- IIT-rushrec – IIT calculation for players with at least one rushing or receiving attempt
- IIT-defense – IIT calculation for players with at least one defensive action
- IIT-kicker – IIT calculation for players with at least one kick or punt attempt