by PuckStopsHere on 08/23/09 at 02:25 PM ET
I have been taking my usual look at sabermetrics and hockey this summer. I have spent most of the time looking at the Corsi Number. The Corsi Number is essentially an alternative to +/- ratings. Instead of using only goals scored to tally ratings, it uses all shots directed at goal (shots on goal, missed shots and blocked shots). This makes the numbers much larger and removes statistical noise to a better degree than +/- does. Corsi is a good judge of puck possession of players. Players with high Corsis tend to dominate in puck possession and those with low Corsis tend to have their opponents dominating in puck possession.
Corsi is not the only alternative to +/- that is used in this manner. Another method, which is less common, is the Fenwick Rating. It is named for Matt Fenwick from the Battle of Alberta blog. He factors out blocked shots from a Corsi Rating to include only shots on goal and missed shots.
Is this an improvement on Corsi? Does the removal of blocked shots better correlate with winning games? Does the reduction in the number of events cost in terms of increased statistical noise? Do the same players rank and the top and bottom in Corsi and Fenwick ratings or is there a systematic difference in these rankings? In the next few posts, I intend to address these issues.
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