NBA advanced metrics, explained
What each impact metric actually measures, where it breaks, and how to read it without fooling yourself. Written for someone who does not already know the jargon. For how we compute ours and how we validate them, see the methodology.
IPM: Informed Plus-Minus, explained
IPM (Informed Plus-Minus) is RAPM shrunk toward a box-score prior instead of zero: how it is built, the 17-of-17 validation, and what it cannot tell you.
RAPM: Regularized Adjusted Plus-Minus, Explained
RAPM (regularized adjusted plus-minus) measures a player's impact per 100 possessions after adjusting for teammates and opponents. Here is how it works.
RAPM vs BPM: what each one actually measures
RAPM measures what happened on the floor; BPM estimates what the box score implies. How each is built, how each fails, and why the best metrics combine both.
EPM vs RAPM vs DARKO vs LEBRON: an honest map
What EPM, RAPM, LEBRON, DARKO and RAPTOR actually do differently, which question each one answers, and where our own IPM fits and where it falls short.
Lineup chemistry: when five players beat the sum of their parts
Lineup chemistry is a five-man unit's RAPM residual: actual net rating minus what the model predicts from the ten players on the floor. How to read it.
WOWY vs on/off: what those numbers actually measure
On/off compares a team with a player on the floor to the same team without him. WOWY does it game by game. Here is what both catch, and what both get wrong.
Shot-making over expected (xeFG)
Expected eFG% separates shot selection from shot making. What xEFG measures, what it misses, and how to read shot-making over expected.
Box Creation and Offensive Load, explained
Ben Taylor's Box Creation estimates the open shots a player generates for teammates per 100 possessions. What it measures and where it stops.