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Originally Posted by DefNotRsigley
3) Handedness. Does it matter? I noticed an abnormal amount of people doing faceoffs are left handed which makes me think that it does. Can compare L vs. L, L vs. R. Maybe try to determine an advantage one should get in a scenario if it does matter.
This question may actually be more complicated than you think. Most players take the face-off on their backhand with a grip they don't ever use otherwise. But what's annoying about modeling it would be that not everyone does. I don't know how you could get that information, especially since I assume some players switch tactics depending on the situation (defensive vs. offensive zone, or whether they have a specific play drawn up). And barely related is that most Canadians learn to play left handed, but most Americans learn to play right handed. (At least this used to be true. And I'm not sure how Euros break down by handedness.) So if you're naturally right handed and also play right handed, maybe you'd have an advantage over some other iterations of handedness in some scenarios.
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4) Does location of the faceoff matter? Related: Does an opening game neutral zone faceoff differ from a mid-game neutral zone faceoff? Might not have enough data to determine this, but maybe a team has an advantage after scoring a goal? I think we should exclude this and only focus on neutral zones because I don't have the pbp data so I can't tell if teams were at full strength in all faceoffs and if that matters.
Location definitely matters, especially since many face-offs are the result of a play that brings with it some other advantage. For example, if a team ices the puck, the face-off is always brought to their defensive zone, PLUS a consequence of icing is that you aren't allowed to substitute players, and those players are likely to be especially tired. And whenever you commit a penalty, the face-off is brought to your defensive zone, and you will have one less player on the ice than the offensive team. In general, neutral-zone face-offs are pretty neutral in terms of who has an advantage, in contrast to defensive-zone face-offs where the attacking team usually has many advantages.
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These are pretty basic questions due to my lack of knowledge about the sport + it's just one event in a bigger game. Any other questions people can think of?
Rule changes may degrade the signal in much of your data. I don't remember how many games you're getting data from, but if it's from many years, some of the stuff before a significant rule change may not be valuable. I think in 2017 there was a rule change that refs were instructed to be more strict on players squaring up properly and staying behind the lines. I think in 2016, they changed the rule of who has to put their stick down first (thought to be a slight disadvantage) from the visiting team to whichever team was in the defensive zone. And for last season, they added a rule that says the attacking team gets to choose which dot they want the face-off to take place at when they have an offensive-zone face-off (presumably to increase scoring).
Another thing to be aware of is that players get kicked out of face-offs pretty regularly (you see it multiple times a game). I don't know if the data you have reflects this. So say you have your top guy about to take the draw, but he tries to get an unfair edge by sliding his skate a little too close to the dot, and the ref boots him. Now you have to use whoever your next best guy is on the ice to take the draw, with the further disadvantage that if he gets booted, it's a 2:00 penalty. So I'd be worried that your data may not reflect how often a top guy gets booted and therefore hurts his team's percentages, since this act may not show up as him actually losing the face-off. I'm sure some players get booted much more than others.
I hate to introduce all these further complications into your model, especially since I don't have a good sense of how significant a lot of them are, but such is the nature of the face-off modeling problem.