A metric that estimates the percentage of field goals made by a team that a particular player assisted on while he was in the game. By definition, field goals made by the player in question are excluded. Assist Percentage can also be calculated for a team rather than an individual player.
In an effort to determine how much impact players have on their teams, sports statisticians have developed metrics such as Assist Percentage. Assists don't tell the entire story in terms of passing efficiency, but examining Assist Percentage can give us clues as to how effective a player is at setting up his teammates for scoring opportunities.
Although the formula itself looks a bit more complicated, the basic idea is to look at all the shots made from the field while a certain player was in the game, and find the percentage of those shots the player assisted on. This value indicates how much "control" a player has over the offense in terms of how many scores are a direct result of his passing ability.