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Originally Posted by LFC_USA
So is the interpretation of xG that Ajax ran good because they outscored xG? Because watching he game it felt like they could have legitimately had 10 goals
It's pretty silly to declare that a team ran good or bad with a one game sample of xG data, except in truly exceptional cases (where it would also be obvious to the eye test). I'd imagine scoring four goals from 2.7 xG is easily within a normal range of outcomes. Actually something that I think would be interesting to post along with the raw xG of a team in a given match would be how often teams with that xG score 0,1,2,3 or 4 goals.
Plus, of course, finishing a difficult chance is as much skill as making a difficult pass to create an easy chance. It's just that the data clearly suggests that the latter is more of a repeatable skill and a more sustainable way of creating offense.
Thing is, when you say they could've had 10 goals you're doing the same thing that xG is attempting, which is assessing the chances created by the team... and we know that people in general way overrate the likelihood of any given chance being taken. In small samples it's always possible that xG misses something of course, like a potential tap-in that the strikers just misses getting to and isn't counted as a shot. But on the vast majority of chances, I'd say that xG gives you a better idea of how likely it was to result in a goal than someone on TV yelling "HE HAS TO SCORE"