About Pro-Football-Reference.com

Sources

Football Stats Glossary
All of the stats of Pro-Football-Reference.com

Pro Football Positions
Explanation of each position abbreviation on our site

Advanced Stats
Explanation of the advanced stats available on the site

Win Probability Explained
Step-by-step explanation of Win Probability

Approximate Value
Explanation of the meaning and calculation of Approximate Value

Hall of Fame Monitor
Explanation of the meaning and calculation of PFR's Hall of Fame estimation system

Comebacks and Game-Winning Drives
Learn the meaning of a fourth quarter comeback or game-winning drive

Leaderboard Minimums
Statistical minimums required to be on a season or career leaderboard for a rate stat

Statistical Coverage
Find out what years we have certain stats for