Five-player units reveal chemistry and fit
A basketball lineup's plus-minus is the net point differential for that five-player combination per 100 possessions. A lineup pairing a sharp-shooting guard with a versatile forward and a strong rim protector might show +8.5, meaning that unit outscores opponents by 8.5 points per 100 possessions when it's on court. Sorting lineups by this metric reveals which combinations work best, independent of overall team record.
Duration and sample size cautions
A lineup's statistics are only reliable after hundreds of possessions together. Early in a season, a five-player combination might show +15 after only 100 possessions simply by luck. By 1,000 possessions, the true effect emerges. Coaches use this data to decide starters and closing lineups, but the gap between early-season noise and reliable signal often determines mid-season trades before sample size clarifies who actually fits.