Regression to the mean: why streaks mislead
Hot and cold runs end. How not to mistake short-term luck for true level.
A team wins five in a row and the market treats it as unbeatable. Another loses three and is written off. Most of the time, both prices are overdone — and the culprit is regression to the mean.
What it is
Performance has a skill part and a luck part. Skill persists; luck does not. After an extreme run — up or down — the next result tends to move back toward the team's true level. Not because of some "law of balance," but because the luck that produced the extreme simply does not repeat.
How it shows up in football
Look at the underlying signals, not just the scoreline. A team winning well above its xG is finishing above expectation — something that usually normalises. A team creating chances but not converting tends to start scoring again. The streak fades; the level remains.
The mistake it prevents
The average bettor chases recent form precisely when it is about to correct. Reading regression often means going against the narrative — and that is where the market most often misprices.
No read removes chance. Bet responsibly, and be suspicious of explanations that sound too good.