"Goals preventedWe’ve been through this. It’s the goals he conceded compared to how many he should have conceded. Look up xGOT (not xG)
Given that expected goals on target (xGOT) measures the probability of shots on target resulting in goals, the only factor preventing them being scored is the goalkeeper. A shot that is worth 0.3 xGOT has a 30-per-cent likelihood of being scored but it is also a shot that has a 70-per-cent chance of being prevented by the goalkeeper.
This means that we can predict how many goals a goalkeeper would be expected to concede, based on the quality of the shots that they faced. It allows us to directly credit to goalkeepers for their ability to prevent goals, irrespective of their team's defensive strengths.
For example, during the Premier League 2019/20 season, Sheffield United's Dean Henderson was one of the standout performers. Based on the quality of the shots on target the Manchester United loanee faced (39.4 xGOT), the average goalkeeper would have been expected to concede over 39 goals. Given he only conceded 32 goals (excluding penalties and own goals), we can credit Henderson with preventing more than seven goals with his saves, which was the fourth highest in the Premier League that season."
https://www.skysports.com/football/...measures the quality,to do with these chances.
Why do they exclude penalties and own goals? Surely some of them are easier to save than others and they should be included in the statistics?
Some own goals may be the goalkeepers fault even.
As usual with statistics, they present a facade of being scientific but when you analyse the methodology there is a lot lacking.