Sports Magazine

HABS: Combining Corsi and Scoring-chance Numbers

By Kicks @Chrisboucher73
This post will focus on merging scoring-chance numbers with corsi-events.
Corsi-events represent both the attempted shots a player's team attempts on the opposing team's net, as well as the attempted shots that occur on that player's own net while he is on the ice.
The scoring-chance number included here are part of my data-generated player tracking system. A player is credited with a scoring-chance for or against only when he is directly involved, or directly responsible for the play that produces the scoring-chance. A chance occurs when a team attempts a shot, or deflects a puck toward the net while positioned in the slot.
(special thank you to www.extraskater.com for the corsi-numbers). A list of all the events I track can be found here.
EVEN-STRENGTH CORSI-FOR PERCENTAGE (SEASON AND PLAYOFFS)
This graph shows each player's corsi-for percentage at even-strength. It includes events from both the 2013-14 regular season, as well as the 2014 playoffs.
Among defensemen, the highest corsi-for percentages were produced by Jarred Tinordi, PK Subban, and Andre Markov. That said, only Tinordi (small sample size) earned a corsi-for rating that was above 50%. The lowest corsi-percentages among d-men were earned by Douglas Murray and Mike Weaver.
The top corsi-for percentages among forwards were produced by David Desharnais, Brendan Gallagher, and Max Pacioretty. The lowest shot-attempt for percentages were earned by Ryan White and George Parros.
When looking at the graph, it's important to remember that zone-starts impact corsi numbers.

EVEN-STRENGTH CORSI FOR AND AGAINST PER-60
This graph shows the number of even-strength corsi for and against events that occur while each player is on the ice per-60 minutes.
As we can see, Murray and Parros were on the ice for substantially more corsi-events against per-60 than the Habs other players. Among d-men PK Subban and Jarred Tinordi were on the ice for the fewest corsi-against events per-60. Among forwards, Desharnais, Gallagher, and Max Pacioretty were on the ice for the fewest corsi against events per-60.
Gallagher and Pacioretty were on the ice for the most shot-attempts on the other net per-60 minutes of even-strength ice-time.

EVEN-STRENGTH SCORING-CHANCES AGAINST PER-60 MINUTES
This graph shows the number of even-strength scoring chances for and against each player was directly involved-in per-60 minutes of even-strength ice-time. As a result of increased defensive-responsibility, defensemen are generally responsible for more chances-against than forwards, while centremen are responsible for more chances against than wingers. Obviously, the opposite occurs for scoring-chances FOR; with wingers producing more, and defensemen producing the fewest.
Among d-men, Tinordi and Murray were directly responsible for more ES scoring-chances against than any other Habs players. Among forwards, Lars Eller and White were responsible for the most SC-against per-60, while Dale Weise, Travis Moen, and Michael Bournival were responsible for the most chances-against per-60 among wingers.
Thomas Vanek, Pacioretty, and Gallagher helped produce more scoring-chances than all other Habs players. Among d-men, Nathan Beaulieu, Subban and Andrei Markov produced the most chances per-60 minutes of ES ice-time.

PERCENTAGE OF SCORING-CHANCES FOR PER-CORSI-FOR EVENT
This graph shows the percentage of even-strength scoring-chances each player produces per-corsi for event. The higher the percentage the more scoring-chances each player created per-corsi event. A player is credited with a scoring-chance only when he is directly involved in the play that produced the scoring-chance. The calculation is done by taking the number of scoring-chances each player was involved in creating and dividing it by the number of corsi-for events that occurred while the player was on the ice.
These numbers take corsi-events and use them to tell a more indicative story about players' offensive-contributions. As we can see, Beaulieu, Subban, and Markov helped produce a higher-percentage of scoring-chances per corsi-event than other Habs d-men.
Vanek was responsible for a higher percentage of scoring-chances per-corsi-for event than any other Montreal player, while Pacioretty produced the second-highest percentage. Parros had the lowest percentage, while Alex Galchenyuk surprisingly had the second-lowest percentage.

PERCENTAGE OF SCORING-CHANCES-AGAINST PER-CORSI-AGAINST EVENT
This graph shows the percentage of even-strength scoring-chances-against each player was directly responsible for per-corsi for event. The higher the percentage the more scoring-chances-against each player was responsible for per-corsi event. A player is credited with a scoring-chance-against only when he is directly involved in the play that produced the scoring-chance. The calculation is done by taking the number of scoring-chances-against each player was responsible for allowing and dividing it by the number of corsi-against events that occurred while the player was on the ice .
This graph paints a substantially different picture of Tinordi's defensive-value than corsi. Twenty-three percent of the Corsi-against events that occurred while Tinordi was on the ice resulted in a scoring-chance for the opposition. In other words, Tinordi was directly-responsible for a scoring-chance against 23% of the time the other team attempted a shot on the Habs net while he was on the ice.
On the other hand, Josh Gorges was directly responsible for a scoring-chance against only 10.1% of the time the other team produced a corsi-against event while he was on the ice. Among forwards, Eller produced the highest-percentage (not a good thing); in fact Eller's percentage was actually higher than Gorges'.
Despite facing the toughest opposition, Tomas Plekanec was responsible for the lowest percentage of scoring-chances per-corsi event against among centres. Among all skaters, Brandon Prust was responsible for the lowest-percentage of chances against per-corsi against.


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