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Decent article here which I think answers my questions.https://jobsinfootball.com/blog/what-is-expected-goals-xg/#:~:text=xG%20is%20calculated%20using%20a,scale%20between%200%20and%201.Key sections:One thing that's important to note is that different xG models can be used by different organisations and competitions. Each model has its own characteristics, although they generally all rely on the same major factors: distance to goal, angle to goal, body part with which the shot is taken, plus the type of assist or prior action (eg. cross, through-ball, set-piece, short pass, dribble etc.) Models use all the information they have on shots with similar characteristics to come up with a mathematical value relating to how much a player would be expected to score the relevant chance....There are limitations in terms of the data available. For instance, there's a lack of information on the exact state of play when a shot is taken. As the years go on and the data continues to get better, these limitations will gradually be removed or at least reduced.That's kind of what I thought. So Miller's miss against Rochdale will have been graded as "20 yards out, shot, player running with ball". For which I'd guess you'd expect a goal maybe once in ten? Whereas in fact it was an absolutely open net and if taken with the left foot, you'd expect a goal 19 times out of 20.Similarly with the Sutton chance. Shot from cross in front of goal 4 yards out might be xG=0.3. But factor in the goalkeeper being 6 yards off to the side, no defender either in front to block or making a challenge and it would be xG=0.95.I guess the idea is that over a season, these factors even out. I'm not sure that's the case with Miller though, where he has frequently created or got on the end of really good chances and fluffed them because of the left foot thing. I'd say with the chances he's made, I'd expect a decent finisher to be scoring every other game (xG = 0.5).
Quote from: BillyStubbsTears on March 01, 2023, 07:08:32 pmDecent article here which I think answers my questions.https://jobsinfootball.com/blog/what-is-expected-goals-xg/#:~:text=xG%20is%20calculated%20using%20a,scale%20between%200%20and%201.Key sections:One thing that's important to note is that different xG models can be used by different organisations and competitions. Each model has its own characteristics, although they generally all rely on the same major factors: distance to goal, angle to goal, body part with which the shot is taken, plus the type of assist or prior action (eg. cross, through-ball, set-piece, short pass, dribble etc.) Models use all the information they have on shots with similar characteristics to come up with a mathematical value relating to how much a player would be expected to score the relevant chance....There are limitations in terms of the data available. For instance, there's a lack of information on the exact state of play when a shot is taken. As the years go on and the data continues to get better, these limitations will gradually be removed or at least reduced.That's kind of what I thought. So Miller's miss against Rochdale will have been graded as "20 yards out, shot, player running with ball". For which I'd guess you'd expect a goal maybe once in ten? Whereas in fact it was an absolutely open net and if taken with the left foot, you'd expect a goal 19 times out of 20.Similarly with the Sutton chance. Shot from cross in front of goal 4 yards out might be xG=0.3. But factor in the goalkeeper being 6 yards off to the side, no defender either in front to block or making a challenge and it would be xG=0.95.I guess the idea is that over a season, these factors even out. I'm not sure that's the case with Miller though, where he has frequently created or got on the end of really good chances and fluffed them because of the left foot thing. I'd say with the chances he's made, I'd expect a decent finisher to be scoring every other game (xG = 0.5).It depends on the site, StatsBomb are probably the market leaders, their xG takes into account defenders/goalkeepers positioning. They also offer post shot xG figures such as shot velocity which can show how good a player is at finishing.
Decent article here which I think answers my questions.https://jobsinfootball.com/blog/what-is-expected-goals-xg/#:~:text=xG%20is%20calculated%20using%20a,scale%20between%200%20and%201.Key sections:One thing that's important to note is that different xG models can be used by different organisations and competitions. Each model has its own characteristics, although they generally all rely on the same major factors: distance to goal, angle to goal, body part with which the shot is taken, plus the type of assist or prior action (eg. cross, through-ball, set-piece, short pass, dribble etc.) Models use all the information they have on shots with similar characteristics to come up with a mathematical value relating to how much a player would be expected to score the relevant chance....There are limitations in terms of the data available. For instance, there's a lack of information on the exact state of play when a shot is taken. As the years go on and the data continues to get better, these limitations will gradually be removed or at least reduced.That's kind of what I thought. So Miller's miss against Rochdale will have been graded as "20 yards out, shot, player running with ball". For which I'd guess you'd expect a goal maybe once in ten? Whereas in fact it was an absolutely open net and if taken with the left foot, you'd expect a goal 19 times out of 20.Similarly with the Sutton chance. Shot from cross in front of goal 4 yards out might be xG=0.3. But factor in the goalkeeper being 6 yards off to the side, no defender either in front to block or making a challenge and it would be xG=0.95.I guess the idea is that over a season, these factors even out. I'm not sure that's the case with Miller though, where he has frequently created or got on the end of really good chances and fluffed them because of the left foot thing. I'd say with the chances he's made, I'd expect a decent finisher to be scoring every other game (xG = 0.5).
Quote from: DonnyOsmond on March 01, 2023, 08:13:50 pmQuote from: BillyStubbsTears on March 01, 2023, 07:08:32 pmDecent article here which I think answers my questions.https://jobsinfootball.com/blog/what-is-expected-goals-xg/#:~:text=xG%20is%20calculated%20using%20a,scale%20between%200%20and%201.Key sections:One thing that's important to note is that different xG models can be used by different organisations and competitions. Each model has its own characteristics, although they generally all rely on the same major factors: distance to goal, angle to goal, body part with which the shot is taken, plus the type of assist or prior action (eg. cross, through-ball, set-piece, short pass, dribble etc.) Models use all the information they have on shots with similar characteristics to come up with a mathematical value relating to how much a player would be expected to score the relevant chance....There are limitations in terms of the data available. For instance, there's a lack of information on the exact state of play when a shot is taken. As the years go on and the data continues to get better, these limitations will gradually be removed or at least reduced.That's kind of what I thought. So Miller's miss against Rochdale will have been graded as "20 yards out, shot, player running with ball". For which I'd guess you'd expect a goal maybe once in ten? Whereas in fact it was an absolutely open net and if taken with the left foot, you'd expect a goal 19 times out of 20.Similarly with the Sutton chance. Shot from cross in front of goal 4 yards out might be xG=0.3. But factor in the goalkeeper being 6 yards off to the side, no defender either in front to block or making a challenge and it would be xG=0.95.I guess the idea is that over a season, these factors even out. I'm not sure that's the case with Miller though, where he has frequently created or got on the end of really good chances and fluffed them because of the left foot thing. I'd say with the chances he's made, I'd expect a decent finisher to be scoring every other game (xG = 0.5).It depends on the site, StatsBomb are probably the market leaders, their xG takes into account defenders/goalkeepers positioning. They also offer post shot xG figures such as shot velocity which can show how good a player is at finishing.I'd be very interested to see what they had Miller's xG figures to be for the Sutton and Rochdale away games then.
Quote from: BillyStubbsTears on March 01, 2023, 07:08:32 pmDecent article here which I think answers my questions.https://jobsinfootball.com/blog/what-is-expected-goals-xg/#:~:text=xG%20is%20calculated%20using%20a,scale%20between%200%20and%201.Key sections:One thing that's important to note is that different xG models can be used by different organisations and competitions. Each model has its own characteristics, although they generally all rely on the same major factors: distance to goal, angle to goal, body part with which the shot is taken, plus the type of assist or prior action (eg. cross, through-ball, set-piece, short pass, dribble etc.) Models use all the information they have on shots with similar characteristics to come up with a mathematical value relating to how much a player would be expected to score the relevant chance....There are limitations in terms of the data available. For instance, there's a lack of information on the exact state of play when a shot is taken. As the years go on and the data continues to get better, these limitations will gradually be removed or at least reduced.That's kind of what I thought. So Miller's miss against Rochdale will have been graded as "20 yards out, shot, player running with ball". For which I'd guess you'd expect a goal maybe once in ten? Whereas in fact it was an absolutely open net and if taken with the left foot, you'd expect a goal 19 times out of 20.Similarly with the Sutton chance. Shot from cross in front of goal 4 yards out might be xG=0.3. But factor in the goalkeeper being 6 yards off to the side, no defender either in front to block or making a challenge and it would be xG=0.95.I guess the idea is that over a season, these factors even out. I'm not sure that's the case with Miller though, where he has frequently created or got on the end of really good chances and fluffed them because of the left foot thing. I'd say with the chances he's made, I'd expect a decent finisher to be scoring every other game (xG = 0.5).It depends on the site, StatsBomb are probably the market leaders, their xG takes into account defenders/goalkeepers positioning. They also offer post shot xG figures such as shot velocity which can show how good a player is at finishing.
Decent article here which I think answers my questions.https://jobsinfootball.com/blog/what-is-expected-goals-xg/#:~:text=xG%20is%20calculated%20using%20a,scale%20between%200%20and%201.Key sections:One thing that's important to note is that different xG models can be used by different organisations and competitions. Each model has its own characteristics, although they generally all rely on the same major factors: distance to goal, angle to goal, body part with which the shot is taken, plus the type of assist or prior action (eg. cross, through-ball, set-piece, short pass, dribble etc.) Models use all the information they have on shots with similar characteristics to come up with a mathematical value relating to how much a player would be expected to score the relevant chance....There are limitations in terms of the data available. For instance, there's a lack of information on the exact state of play when a shot is taken. As the years go on and the data continues to get better, these limitations will gradually be removed or at least reduced.That's kind of what I thought. So Miller's miss against Rochdale will have been graded as "20 yards out, shot, player running with ball". For which I'd guess you'd expect a goal maybe once in ten? Whereas in fact it was an absolutely open net and if taken with the left foot, you'd expect a goal 19 times out of 20.Similarly with the Sutton chance. Shot from cross in front of goal 4 yards out might be xG=0.3. But factor in the goalkeeper being 6 yards off to the side, no defender either in front to block or making a challenge and it would be xG=0.95.I guess the idea is that over a season, these factors even out. I'm not sure that's the case with Miller though, where he has frequently created or got on the end of really good chances and fluffed them because of the left foot thing. I'd say with the chances he's made, I'd expect a decent finisher to be scoring every other game (xG = 0.5).
Ah now. Assuming you're referring to the Sutton game, the question then is, is that 0.7 calculated from the chance that it became, when he took the ball with his right foot and brought the defender into play? Or the chance it should have been if he'd simply stepped into the ball with his left and eliminated the defender from the issue?Seems to me it must be the former. Because the latter really is as easy a chance as a striker could ever hope for. I simply don't believe that an average striker would miss that 3 times in 10.