Reference
NHL analytics glossary
Every metric this API returns, with the formula, what it is for, and the specific way people get it wrong. Written from how these are actually computed here, not paraphrased.
A team's share of all shot attempts while it is on the ice — the oldest and bluntest measure of who is controlling play.
Corsi with blocked shots removed — a slightly cleaner read on possession, and a better predictor of goals.
The sum of every shot's probability of becoming a goal, given where and how it was taken.
Expected goals against minus goals actually allowed — how many goals a goalie saved that an average goalie would not have.
Save percentage on shots from the slot — about a quarter of all shots, and the ones that decide games.
Shots stopped as a share of shots faced. The oldest goalie stat, and the one most distorted by the team in front.
Shooting percentage plus save percentage. It regresses hard toward 100, which is the entire point of looking at it.
Goals allowed per sixty minutes of play. The oldest goalie stat, and the one that tells you most about the team in front.
How many skaters each side has on the ice. Almost every number worth reading is filtered to one of these.
Where on the ice a play happened, in feet, already turned so every team attacks the same end.
Goals for minus goals against while a skater was on the ice, at even strength and shorthanded.
Goals as a share of shots on goal. Half of PDO, and the half that regresses hardest.
Points won as a share of points available. The only fair way to compare teams that have played a different number of games.