A week or so ago, the guys at Hockey Abstract put together Player Usage Charts (.pdf) for the 2011/2012 Season, which maps for all 30 teams how each player was utilized and how well they performed in that role from a Corsi perspective.
More recently, the site released its Free Agent Finder spreadsheet (.xlsx) which, along with providing a smorgasbord of advanced stats in excel form for all pending UFAs, provided the template to recreate these Usage charts for any set of players. Like, the Maple Leafs rosters over the past 5 years for instance.
How to Read the Charts:
- X-axis: Offensive Zone Start Percentage. This is the percentage of faceoffs taken in the offensive zone relative to all Ozone and Dzone faceoffs the player was on the ice for at even strength. Essentially this should be interpreted as how coaches deployed the player relative to the rest of his team - High Ozone starts (more to the right) mean the player was given advantageous offense situations more often than not, and less Ozone starts (more to the left) mean the player was utilized more in defensive situations. Some studies on how meaningful this stat is can be found at NHLNumbers, Habs Eyes on the Prize, the Score, while a differing perspective can be found at Hockey Analysis.
- Y-axis: Quality of Competition. Measured by Corsi rel QoC, which is defined at Puck Prospectus as:
A measure of competition quality using relative Corsi as its basis. It is less luck-driven than QualComp and more universal than Corsi QoC because it's based on a relative metric. The most statistically sound quality of competition metric currently used.
- This should be interpreted on the chart as how difficult the competition faced was over the season, so a player facing very tough competition would be closer to the top and a player facing very easy competition would be closer to the bottom.
Bubble Size/Colour: The size and shading of the bubbles is measured by Corsi Rel, which is essentially how strong a players Corsi numbers are when on the ice compared to how the team's Corsi was when the player is off the ice. The blue shaded bubbles are positive Corsi Rel (bigger the better), the white bubbles are negative Corsi Rel (bigger is worse).
- Where a player is located on the chart can have their use determined by the following matrix (from the Player Usage pdf):
Without further adieu, here are the Maple Leafs rosters for the previous 4 years (min 30GP):
So, do these charts change your opinion on any players and how you thought of them while they were here? Any players better/worse than you expected from a Corsi perspective? I may have partially come around on Nikolai Kulemin's role on this team, and continue to be ecstatic that Mikhail Grabovski is still on the roster.