Yep, i think it was goalie coach that developed it. But Beagle is a great example: when the opposing goalie saw Beagle on the ice, the stat would tell him not to expect high shot volumes, completely disregarding that he is a primary defensive player that shouldn’t necessarily have high offensive zone percentage or shot volumes, so from that point of view, his Corsi shouldn’t be high.
But that doesn’t make for good stat-tainment
Hey DC!
You’re correct. It was a goalie coach, I believe, for the Sabres. His last name was Corsi. (I don’t remember his first name)!
When I first joined the old board, and saw some of you veterans whipping out analytics, I went and got a basic hockey analytics book! It was extremely informative, but also had way too much analysis for my blood, so I didn’t read the whole thing, just the parts that I found relative, and interestingly informative, for what I like about the game! I’m certainly NO EXPERT, on analytics, at all!
The original Corsi stat was for team analysis of puck possession! Using shots for, AND shots against, as an overall indicator for puck possession time! It includes shots on goal, (SOG), missed shots, and blocked shots, both FOR and AGAINST! The idea being that if your team had a higher total shots number, than your opponent, it was a good indicator that you had more puck possession time! Again, it was a team stat!
The now, more famous +/- Corsi stat, is for INDIVIDUAL players, and can be for Goals For/Goals Against, when THAT PLAYER is on the ice! You can also add in SOG, Bks, Ms, both for and against, when that player is on the ice, for another Corsi-type stat! These are all assumed at even strength, 5 on 5.
When you say, Corsi-type stat, it refers to the concept of almost any hockey stat, where the comparison is any measurable team statistic, relative to when that player is on the ice! You can even compare player to player, and for me, some can get to the point of absurd!
However, a good example would be, what is the teams S%, (shooting percentage), when, say, Orlov is on the ice? OR when Orlov is NOT on the ice! OR the OPPONENTS S%, with Orlov, on or off the ice?
Another could be, comparing a teams giveaway/takeaway ratio, when a given player is on the ice, versus, off the ice!
The endless combinations can go on to infinity! ( that’s why I didn’t finish the book ), LOL.
Rush