Quantified Shooter Impact (qSI) is a metric developed by using Second Spectrum video tracking data. It simply measures the impact of the player, compared to league average.
With using the video tracking data, we are able to break down effective field goal percentage to;
– “quality of the shot” (toughness of the shot)
– “impact of the shooter” (the ability of a player to finish).
Quantified Shooter Impact (qSI) Formula=Effective Field Goal Percentage – Shot Quality (qSQ)