Methodology & Providers
Provider Models Compared in the football data vault
How Opta and StatsBomb approach the same match differently.
Core metricMethodology & Providers
The rules behind the numbers: event definitions, sample size, how the major provider models differ, why credible totals disagree and how to keep a dataset clean.
Methodology & Providers
Event Definitions and Their Effect: a data reference
From raw log to metric: where the definition enters and what it moves.
Advanced / contested
Methodology & Providers
Why Two Credible Totals Disagree: a data reference
Five mechanisms that make two correct numbers differ, and how to identify them.
Core metric
Methodology & Providers
Data Hygiene and Verification: definition and limits
The routine checks that catch the errors analysis cannot see.
Core metric
Methodology & Providers
Counting Rules and Comparability: a data reference
The rule set behind this vault, stated in one place.
Core metric