Do Premier League officials have a subconscious bias? Gary O'Neil thinks so after Jones Stones winner - is he onto something?

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Do Premier League officials have a subconscious bias? Gary O

Wolves manager Gary Oâ€™Neil has suggested that officials may unconsciously favor bigger clubs when making decisions during matches. However, the validity of this claim remains a contentious issue within the football community.

O'Neil suggested the officials may have been influenced when reviewing John Stones' stoppage-time winner in his side's 2-1 defeat to Manchester City on Sunday.

His frustration may stem from the disproportionate effect VAR has had on Wolves.

According to VAR expert Dale Johnson, Wolves would have a 13-goal positive swing in goal difference without VAR interventions since its introduction in 2019/20 - the largest negative impact on any Premier League team.

However, there's no clear evidence that VAR consistently favours bigger teams. Fulham, who finished just one point ahead of Wolves last season, have benefited the most from VAR, with a net gain of 11 goals thanks to decisions from Stockley Park.

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Do referees penalise smaller clubs more?

While it has been a thorn for winless Wolves, VAR ultimately gets most decisions right, and a club's individual experience with it doesn't necessarily indicate biased officiating.

To explore whether big clubs receive preferential treatment, we analysed the average number of fouls they commit per card received.

At first glance, the difference appears minimal. The graph below illustrates the gap in fouls per card between the traditional 'Big Six' clubs and the rest of the league.

Last season, 'Big Six' teams were allowed to commit just 0.16 more fouls before receiving a yellow or red card - hardly enough to suggest widespread favouritism.

However, a different picture emerges when we focus on clashes between 'Big Six' teams and so-called 'smaller' clubs.

In every season since 2010/11, referees have shown more leniency toward the 'Big Six' in these match-ups. The starkest example came in 2020/21, when 'Big Six' teams were allowed, on average, 2.29 extra fouls before seeing a card against 'non-Big Six' opponents.

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How do teams manage after seeing red?

William Saliba's red card was another major refereeing decision from last weekend. Arteta's side will sorely miss his defensive prowess ahead of Sunday's early-season title clash against Liverpool.

Hauling down Evanilson almost certainly prevented a clear goal-scoring opportunity. Still, the data suggests that, considering the early stage of the match, Arsenal might have been better off letting him run through on goal unchallenged.

We analysed every Premier League red card given when teams were level, and how the red-carded team fared in the rest of the match. As one might expect, the earlier a player is sent off the less likely it is their team will avoid defeat.

Saliba received his marching orders at the 30-minute mark, leaving his team at a significant disadvantage. Historically, teams reduced to 10 men at this stage lose 52 per cent of the time, and win in just 13 per cent of matches.

If Arsenal had been ahead, Saliba's decision to stop the goal-scoring opportunity might have been more justified from a risk-reward perspective. In most instances, Premier League teams leading when reduced to 10 men, manage to avoid defeat.

Teams that receive a red card after half-time while leading often manage to hold on for all three points, making the gamble more worthwhile.