Football statisticians and economists have been debating the new manager bounce for decades. They fall into two distinct camps.
The Skeptics: It's All Regression to the Mean
The "regression to the mean" camp argues that the bounce is essentially a statistical illusion. Their reasoning is compelling.
When teams sack managers, they typically do so when results are at an unusually low point—often averaging around 1 point per game. However, most teams' natural performance level is closer to 1.3 points per game. Whether or not they change managers, statistical theory suggests their results will naturally return toward this average.
"Typically, the average club earns 1.3 points a match. Typically, a club sacks its manager when it averages only 1 point a match... Any statistician can predict what should happen after a low point: whether or not the club sacks its manager, its performance will probably regress to the mean." — Simon Kuper & Stefan Szymanski, authors of Soccernomics
The evidence supporting this view is substantial.
The Dutch Eredivisie Study (1986-2004): Economist Dr. Bas ter Weel analysed 18 seasons of data and found that teams that didn't sack their managers showed similar recovery patterns to those that did. The improvement happened regardless of whether a change was made.
"Changing a manager during a crisis in the season does improve the results in the short term. But this is a misleading statistic because not changing the manager would have had the same result." — Dr. Bas ter Weel, Dutch economist
The Independent's Conclusion: After reviewing multiple studies, they reported: "On average, an in-season replacement of the manager has zero effect on performances, either during the season or in the long run."
Soccernomics' Take: Simon Kuper and Stefan Szymanski's influential book provides perhaps the clearest explanation of the regression to mean theory.
Understanding the distinction between form, variance, and luck in sports betting is crucial when analysing whether performance improvements represent genuine change or simply statistical noise.
The Believers: Psychological Factors Drive Real Improvement
The opposing camp acknowledges the statistical argument but insists that genuine psychological factors also contribute. They point to several mechanisms that create a real bounce, not just a statistical one.
1. The "Dead Man Walking" Effect: Players often know a manager is on the brink before the official announcement. Motivation drops. Effort decreases. Performances suffer. When a new manager arrives, that immediately changes.
2. Tactical Uncertainty for Opponents: New managers often bring different formations, playing styles, or player roles. Opposition teams have limited time to prepare for these changes, creating a temporary advantage.
3. Clean Slates for Underperformers: Players who were marginalised or dropped under the previous regime get a fresh opportunity. This can unlock talent that was previously suppressed.
4. The Selection Effect: Boards often time sackings to maximise the bounce's potential—scheduling changes before international breaks, easier fixtures, or when injured players are returning. This creates a perceived bounce that's actually just smart timing.
The believers point to examples like Ole Gunnar Solskjaer at Manchester United, who won his first eight games in charge, or Thomas Tuchel at Chelsea, who went 14 games unbeaten after replacing Frank Lampard. These cases, they argue, go beyond what statistical regression can explain.
The Reality: Both Sides Are Partly Right
The most recent research suggests that both camps have valid points. The bounce is partly statistical regression to the mean AND partly genuine psychological improvement.
A comprehensive study of Premier League managerial changes between 2003/04 and 2012/13 found:
- Points per match before change: 1.03
- Points per match after change: 1.17
- Improvement: +0.14 points per match (roughly +5.32 points over a 38-game season)
This improvement is relatively small but statistically significant. The study found that league position improvement was only significant for bottom-half clubs—top-half teams showed no meaningful benefit from changing managers.