Form vs trend
Five-match form is mostly noise. Trends across 20–30 matches reveal real change.
What you will learn
- Short-term form windows have wide error bars — expect regression toward season-long rates.
- A trend needs at least a half-season of consistent change to be credible.
- Pair form with role and team-context changes before reading too much in.
Why short windows mislead
A 3-match scoring run can flip a striker’s xG-overperformance by 0.5 goals per game without any change in process.
Variance is highest for low-volume metrics like goals and assists; rate stats stabilise sooner.
What a real trend looks like
Sustained shifts in shots/90, touches in box, or pressures are stronger signals than single-match spikes.
Tactical or positional changes (new manager, role change, injury return) are the most common true causes of trends.