Just read a bbc article about Bamford who apparently has missed 9 good chances this season, but his xG is 4. Can someone explain that?
xG is a way of measuring the probability of scoring from a shot. No matter how easy the chance is there's never going to be a 100% definite you'll score.
So if they classify a good chance as thinking you'll score 1 in every 3 of given the opportunity then it'll be an xg of 0.33
As another poster put it, a penalty is often seen as one of the best chances you'll get or scoring in a match - but not every single one is scored which is why it's measured at 0.76 or whatever... So if you took 100 penalties you'd be expected to score 76 of them on average.
