PDA

View Full Version : Championship xg table.



the other bob wilson
08-05-22, 06:21
I know many are very sceptical about xg ratings and I must say, after watching all forty six of our games this season, I'm struggling to see how we can be as high as we are in this table. Millwall and QPR are a lot lower than their actual finishing positions, but I'd say City are the side with the biggest difference between their finishing and their position in the xg table.

https://twitter.com/EFLStats/status/1523060590108942336/photo/1

UNDERHILL1927
08-05-22, 06:35
I know many are very sceptical about xg ratings and I must say, after watching all forty six of our games this season, I'm struggling to see how we can be as high as we are in this table. Millwall and QPR are a lot lower than their actual finishing positions, but I'd say City are the side with the biggest difference between their finishing and their position in the xg table.

https://twitter.com/EFLStats/status/1523060590108942336/photo/1

Does that mean we have been creating chances but not putting them away? (Not sure how it works). I’d tend to go for that, if it is the case.

I also think we’ve been quite unlucky under Morison on more than a few occasions. We’ve really missed Kieffer Moore this season, even when he played he wasn’t really here. I think if we’d had Hugill (or a similar replacement) from the start we’d be much higher up the league.

LeningradCowboy
08-05-22, 07:29
Does that mean we have been creating chances but not putting them away? (Not sure how it works). I’d tend to go for that, if it is the case.

I also think we’ve been quite unlucky under Morison on more than a few occasions. We’ve really missed Kieffer Moore this season, even when he played he wasn’t really here. I think if we’d had Hugill (or a similar replacement) from the start we’d be much higher up the league.

Hugill scored 4 goals in 18 appearances for us. He wasn't exactly prolific in front of goal.

UNDERHILL1927
08-05-22, 07:48
Hugill scored 4 goals in 18 appearances for us. He wasn't exactly prolific in front of goal.

But still ten times better than our other options

Lawnmower
08-05-22, 08:41
Hugill scored 4 goals in 18 appearances for us. He wasn't exactly prolific in front of goal.

Over a season that would equate to about 11 goals, plus the other work he does. Would certainly have added a good few points .

J R Hartley
08-05-22, 08:47
Xg is the biggest load of bollox in football

The Lone Gunman
08-05-22, 08:57
Xg is the biggest load of bollox in football

Seconded. It's utter nonsense.

xG: 'Cardiff would be a lot higher in the table if they had scored more goals, conceded less, won more matches and lost fewer.'

Yeah, we know. But they didn't. Hence they finished 18th.

Rjk
08-05-22, 08:59
I know many are very sceptical about xg ratings and I must say, after watching all forty six of our games this season, I'm struggling to see how we can be as high as we are in this table. Millwall and QPR are a lot lower than their actual finishing positions, but I'd say City are the side with the biggest difference between their finishing and their position in the xg table.

https://twitter.com/EFLStats/status/1523060590108942336/photo/1

I think it mostly reflects the amount of time we spent chasing games, teams tend to generate more xG if they're trying to get back into a game

J R Hartley
08-05-22, 09:20
Seconded. It's utter nonsense.

xG: 'Cardiff would be a lot higher in the table if they had scored more goals, conceded less, won more matches and lost fewer.'

Yeah, we know. But they didn't. Hence they finished 18th.

Just an excuse for managers and fans to clutch at straws when a result goes against them.

I very rarely see Xg brought into the conversation after a positive result.

Eric the Half a Bee
08-05-22, 09:22
I know many are very sceptical about xg ratings and I must say, after watching all forty six of our games this season, I'm struggling to see how we can be as high as we are in this table. Millwall and QPR are a lot lower than their actual finishing positions, but I'd say City are the side with the biggest difference between their finishing and their position in the xg table.

https://twitter.com/EFLStats/status/1523060590108942336/photo/1

Not too much to say about this, but barely even interesting if you do a comparison of all data in the table with the league table itself.

We conceded 13 more goals than we were expected to. More than any team in the division. Equates to how shit we've been at the back. Scoring 8 less than we were expecting to isn't the highest - West Brom were expected to score 23 more goals than they did.

I concur with others, I think xG is nonsense.

the other bob wilson
08-05-22, 09:23
I think it mostly reflects the amount of time we spent chasing games, teams tend to generate more xG if they're trying to get back into a game

That makes as much sense as anything to explain it. I’m not convinced by xg, but I did find the difference between our positions in both tables fascinating when most sides position in the xg table was so similar to their positions in the league table.

Undercoverinwurzelland
08-05-22, 09:47
Just been looking at each club's top scorers. Apart from us, only Barnsley failed to get anyone into double figures. Flint and Colwill were top for us with 6. (Barnsley's top scorer had 9 - so almost double figures).
That has to change next season.

PhyllisStant
08-05-22, 09:58
XG itself isn't 'total bolox'. However, you have to be careful when interpreting what it means. This example of use IS total bolox as you can't use is to project what would have been over an entire season across all teams and all games. The average punter, and sky sports folk have no idea how to use it but trust me there are some incredibly useful applications for it (and other stats) used by team statisticians for performance management and scouting etc.

lardy
08-05-22, 10:07
XG itself isn't 'total bolox'. However, you have to be careful when interpreting what it means. This example of use IS total bolox as you can't use is to project what would have been over an entire season across all teams and all games. The average punter, and sky sports folk have no idea how to use it but trust me there are some incredibly useful applications for it (and other stats) used by team statisticians for performance management and scouting etc.

Yes, it has its uses although it isn't the magic riddle that solves football. I see people thinking that 55% possession means the team deserved to win, which is a much worse way to interpret a statistic.

If you think of xG as just how many shots did the teams have, and how good were those shots (six yards out vs 30 yard speculative) then that's it. They doomed themselves from the off by calling it 'expected goals'.

William Treseder
08-05-22, 10:13
XG is just wank*ng material for statto’s

PhyllisStant
08-05-22, 10:21
Yes, it has its uses although it isn't the magic riddle that solves football. I see people thinking that 55% possession means the team deserved to win, which is a much worse way to interpret a statistic.

If you think of xG as just how many shots did the teams have, and how good were those shots (six yards out vs 30 yard speculative) then that's it. They doomed themselves from the off by calling it 'expected goals'.

That's not really what XG is. It's all about the quality of the chances created rather than the end product. It's a complex formulae and is often misunderstood. Source: I've done statistical analysis for a living for 20 years

The Lone Gunman
08-05-22, 10:27
Just been looking at each club's top scorers. Apart from us, only Barnsley failed to get anyone into double figures. Flint and Colwill were top for us with 6. (Barnsley's top scorer had 9 - so almost double figures).

You're probably already aware of this anyway, but one of Colwill's goals came in the FA Cup, so City's top Championship scorers this season were:

6 - Aden Flint
5 - Rubin Colwill
5 - Kieffer Moore
4 - Jordan Hugill

That's pretty grim.

The Lone Gunman
08-05-22, 10:31
It's a complex formulae and is often misunderstood.

Correct me if I'm wrong (and I may well be), but doesn't xG differ from site to site? Aren't the figures open to interpretation and based on opinion rather than fact (ie: one person's view of what is a clear opportunity by comparion with another's)?

As far as I'm aware, there's no central, definitive xG source. Is that right?

PhyllisStant
08-05-22, 10:43
Correct me if I'm wrong (and I may well be), but doesn't xG differ from site to site? Aren't the figures open to interpretation and based on opinion rather than fact (ie: one person's view of what is a clear opportunity by comparion with another's)?

As far as I'm aware, there's no central, definitive xG source. Is that right?

I'm pretty sure there a standard algorithm provided by Opta.

PhyllisStant
08-05-22, 10:45
I'm pretty sure there a standard algorithm provided by Opta.

There's an "interesting" article about it here https://theanalyst.com/eu/2021/07/what-are-expected-goals-xg/

lardy
08-05-22, 10:53
That's not really what XG is. It's all about the quality of the chances created rather than the end product. It's a complex formulae and is often misunderstood. Source: I've done statistical analysis for a living for 20 years

Maybe I didn't explain myself clearly but that's what I meant. A shot from the six yard box is higher quality than a 30 yarder from a centre back. They might both be on target but the closer one is more likely to go in, and xG 'grades' that

tforturton
08-05-22, 11:00
I know a few guys who us xg when it comes to making their weekend bets, and I can see how that might help. I can also see that your average pundit might make use of the additional information. But I'm more interested in the Expected Points column, where we came up short by 16 points.

PaulWent76
08-05-22, 11:05
You're probably already aware of this anyway, but one of Colwill's goals came in the FA Cup, so City's top Championship scorers this season were:

6 - Aden Flint
5 - Rubin Colwill
5 - Kieffer Moore
4 - Jordan Hugill

That's pretty grim.

We’ve undoubtedly had a crap season but thinking back to our championship winning season, our top scorers only got 8. Personally I’d be more than happy with every member of the squad scoring 5 or 6.

Rjk
08-05-22, 11:09
Correct me if I'm wrong (and I may well be), but doesn't xG differ from site to site? Aren't the figures open to interpretation and based on opinion rather than fact (ie: one person's view of what is a clear opportunity by comparion with another's)?

As far as I'm aware, there's no central, definitive xG source. Is that right?

yes there are different people calculating their own versions of xG. some of which take into account different things.

the most basic are just looking at the position on the pitch the shot was taken from and comparing it with how many shots from that position in their database went in.

other ones also take into account various other things, like proximity of defenders, position of goalkeeper, where the pass has come from, body position of the player striking the ball etc.
it usually depends on what data is available for the League you are interested in, the lower down the pyramid the less data.
all of these are usually pulled directly from the video feeds by AI rather than humans manually adding the data, which can be a source of error as well.

that said even the most basic version of the stat can be very useful, and the most complex even more so. and there are a range of even more abstract stats like xT or xgChain that have different uses too, often more practical.

lots of the xG content we get in the public domain is often weak, and presented by people with a limited understanding of stats i.e. individual shot xG calculations for a basic style xG might look interesting, but the error bars on them due to the other factors mean that they're not actually very helpful.
looking at rolling xG for like 10 games or more helps to average out some of the problems with the data. "better" xG would possibly need less games (i.e. less shots) to minimise those errors.

one of the big problems with it is how affected by game state it is. we know the first goal in a game changes the way teams set up dramatically.
if we looked at xG teams were creating only while the scores were level (as I've seen some people do) then I think we'd be fairly near the bottom.

Rjk
08-05-22, 11:18
I'm pretty sure there a standard algorithm provided by Opta.

that's the most commonly seen one, but there are others

Undercoverinwurzelland
08-05-22, 11:36
You're probably already aware of this anyway, but one of Colwill's goals came in the FA Cup, so City's top Championship scorers this season were:

6 - Aden Flint
5 - Rubin Colwill
5 - Kieffer Moore
4 - Jordan Hugill

That's pretty grim.
True

The Lone Gunman
08-05-22, 11:39
We’ve undoubtedly had a crap season but thinking back to our championship winning season, our top scorers only got 8.

That's true, but the goals were spread right across the attacking unit:

8 - Helguson
8 - Gunnarsson
8 - Whittingham
7 - Campbell
7 - Noone
6 - Mason
5 - Gestede
5 - Connolly (???)
4 - Bellamy

This time around it was 6 from a centre-back (who scored those goals in 4 games), 5 from a young midfielder who the manager bounces in and out of the team like a yo-yo and 5 from a striker who left in January.

We can only hope that these signings Morison apparently has lined up include at least a couple of strikers.

PaulWent76
08-05-22, 11:42
Amen to that.

Cleve van Leef
08-05-22, 12:24
The only thing that matters is where a team finishes. End of, that’s the real xg or whatever it’s called.

Bobby Dandruff
08-05-22, 13:18
But still ten times better than our other options

I agree.

I’m sorry to see him go as he was easily our best striker and the only one who could control the ball, hold it up and bring other teammates into play (pretty basic requirements admittedly!)

I’m really not sure who they are going to replace him with as Harris just isn’t up to it, and I need to see MUCH more from Watters to be convinced. So who exactly is going to be an upgrade on Hugill?