Articles: Guide

General topics

04 October 2026 · 3 min read

Missing Data or Zero: How to Tell Them Apart in Sports Statistics

Zero means an observed absence of an event; a missing value means no value is available. See how the distinction changes averages, rates and market interpretation.

AI Sports Analytics General topics Beginner

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General topics

04 October 2026 · 3 min read

Future Data Leakage in Betting Backtests: How to Detect It

Check that a backtest uses only information available before a decision, and see why randomly shuffling matches can overstate performance.

AI Sports Analytics General topics Advanced

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General topics

04 October 2026 · 3 min read

Survivorship Bias in Betting Records: Who Is Missing from a Winning Sample

Why visible or surviving wins cannot replace a complete decision log, and how to restore the denominator for an honest performance review.

Bankroll & Mathematics General topics Intermediate

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General topics

04 October 2026 · 3 min read

Calibration and the Brier Score: How to Evaluate a Probability Forecast

The binary Brier-score formula, a worked calculation, reliability bins and why one average score is not enough to assess calibration.

AI Sports Analytics General topics Intermediate

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General topics

04 October 2026 · 3 min read

When Sports Statistics Disagree: Check Definitions, Periods and Updates

A step-by-step check of the event, metric definition, period, timestamp and source version when two summaries show different numbers.

AI Sports Analytics General topics Intermediate

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Football

04 October 2026 · 3 min read

xA and Key Passes: How to Evaluate Chance Creation

Key passes count actions leading to a shot, while xA values the chance created. Compare their denominators, model choices and limitations in match analysis.

Football Analysis Football Intermediate

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Football

04 October 2026 · 3 min read

Post-Shot xG: What Shot Placement Says About Goalkeeping

Post-shot xG estimates the chance of a goal after a shot, using its placement. Learn how it differs from pre-shot xG and what it cannot prove about a goalkeeper.

Football Analysis Football Intermediate

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Football

04 October 2026 · 3 min read

PPDA in Football: How to Read Pressing Intensity

PPDA compares opposition passes with defensive actions in a defined area. Learn the ratio and the limits of interpreting pressing from one number.

Football Analysis Football Intermediate

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Football

04 October 2026 · 3 min read

Progressive Passes: Ball Progression and Actual Danger

What qualifies as a progressive pass, why the threshold depends on the counting system and how to distinguish forward movement from a dangerous chance.

Football Analysis Football Intermediate

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Football

04 October 2026 · 3 min read

Field Tilt: Territorial Pressure Is Not Chance Quality

Field tilt describes where a team advances the ball, not how dangerous its attacks are. This guide explains one common formulation, a 60% example, and the metric’s limits.

Football Analysis Football Intermediate

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Football

04 October 2026 · 3 min read

Attacking Transitions: Reading Risk After a Turnover

After a turnover, risk depends on more than counterattack speed: location, spacing, open lanes, and players behind the ball matter. A worked scenario shows how to read the sequence without treating it as a forecast.

Football Analysis Football Intermediate

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