How It Works
Forwards and defencemen are on separate scales.
The
Offence grade reflects a player’s scoring chance generation
in the sample. Nine different metrics are weighted (see below for a full list), including volume (i.e., how many scoring chances they get), efficiency (i.e., how many passes into the slot they complete), and adjusting for the quality of their team.
The
Transition grade includes 11 metrics, that also accounts for volume, efficiency, and their impact relative to their teammates. Exits are weighted heavier for defenceman, entries heavier for forwards. That’s not just the result of (arguably) an exit being more valuable for a defenceman, but also sample size. Defencemen are usually more involved in breakouts to forwards having more entry attempts.
The
Defence grade is comprised of different components for forwards and defencemen. For forwards, it’s just break ups (which includes NZ break ups, NZ forced dump ins, DZ break ups, DZ slot pass interceptions, DZ shots against that the player contests) and OZ retrievals. For defencemen, it includes break ups, two rush defence metrics, and DZ retrievals.
The
Overall grade is comprised differently for forwards versus defencemen. For forwards, the weighting is offence the highest, followed by transition, defence, and boards-to-middle plays (in that order). Is defence more valuable than transition? Arguably, but defence is weighted less because of the comparatively smaller number of stats that fall into the defence category, and their increased variance.
For defenders, offence, defence, and transition are weighted equally, with boards-to-middle plays filling out the remainder.
Here’s
a sheet with the exact weighting. From here on out, all the changes are likely to be minor as I gather more information.
This is, and I cannot stress this enough,
manually tracked data. Each game takes anywhere from two to four hours, dependent on the camera angle, video quality, and more. Sample sizes around eight games up and generally the most stable, and thus, the more
usable.