Issue link: https://read.uberflip.com/i/1301581
17 WHAT HAPPENED? GLOSSARY NFL player tracking, also known as Next Gen Stats, is the capture of real-time location data, speed, and acceleration—for every player, every play, and on every inch of the field. Sensors throughout the stadium track tags placed on players' shoulder pads, charting individual movements within inches. Passing Stats Time To Throw (TT) Time to Throw measures the average amount of time elapsed from the time of snap to throw on every pass attempt for a passer (sacks excluded). Average Completed Air Yards (CAY) and Average Intended Air Yards (IAY) Air Yards is the vertical yards on a pass attempt at the moment the ball is caught in relation to the line of scrimmage. CAY shows the average Air Yards a passer throws on completions, and IAY shows the average Air Yards a passer throws on all attempts. This metric shows how far the ball is being thrown "downfield." Air Yards is recorded as a negative value when the pass is behind the line of scrimmage. Additionally, Air Yards is calculated into the back of the end zone to better evaluate the true depth of the pass. Average Air Yards Differential (AYD) Air Yards Differential is calculated by subtracting the passer's average Intended Air Yards from his average Completed Air Yards. This stat indicates if he is, on average, attempting more deep passes than he completes. Defining the stats Longest Completed Air Distance (LCAD) Air Distance is the number of yards the ball has traveled on a pass, from the point of release to the point of reception (as the crow flies). Unlike Air Yards, Air Distance measures the actual distance the passer throws the ball. Aggressiveness (AGG%) Aggressiveness tracks the number of passing attempts a quarterback makes that are into tight coverage, where there is a defender within one yard or less of the receiver at the time of completion or incompletion. AGG is shown as a percentage of attempts into tight windows over all passing attempts. Air Yards to the Sticks (AYTS) Air Yards to the Sticks shows the number of Air Yards ahead or behind the first-down marker on all attempts for a passer. The metric indicates if the passer is attempting his passes past the first-down marker or if he is relying on his skill position players to make yards after the catch. Completion Probability The probability of a pass completion, based on numerous factors such as receiver separation from the nearest defender, where the receiver is on the field, the separation the passer had at the time of the throw from the nearest pass rusher, and more. Expected Completion Percentage (xCOMP) Using a passer's Completion Probability on every play, xCOMP determines what a passer's completion percentage is expected to be.