Not quite a half-century ago, Andy Hill was a junior college basketball coach who came up with a new idea for a statistic. What the plus/minus rating has become in the years since still surprises him.

On-off data is the most basic data available for tracking how a team performs when a player is on or off, but it can be improved with luck-adjusted ratings.

Clutch Stats: Data reflecting team and player performances during the last five minutes of a game that is within five points. Historical Data: Statistics going back to the league’s inaugural ...