CORSI - Named for former Buffalo Sabres goaltending coach Jim Corsi, who tracked shot attempts for and against taken by a team or player. In other words, it's the sum of a team or players's goals, shots on net, shots that miss the net, and shots that are blocked. It's used as a proxy for puck possession. For players, we usually measure "on-ice" corsi, or all of their team's shot attempts while they're on the ice.
FENWICK - Named for blogger Matt Fenwick, it's very similar to Corsi and in most cases, can be considered interchangeable. Fenwick is the number of unblocked shot attempts by a team or player. It's the same as Corsi, but excludes shots that are blocked. It's used because over many games it's a slightly better proxy for possession than Corsi. It's not used exclusively instead of Corsi mainly because over smaller sample sizes, the larger Corsi number is more accurate in reflecting puck possession.
DEPLOYMENT - Player deployment metrics are used to track how players are used in game situations. Most common are zone starts, which show how often a player begins his shift in the defensive zone, offensive zone, or neutral zone. You'll see these abbreviated as DZS%, OZS% and NZS%.
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