Knowledge Base – Betting Glossary
Gecko Edge Betting Glossary
🎯 Core Concepts
- Expected Value (EV): A measure of whether a bet is profitable long-term. A +EV bet means the odds are higher than the true probability.
- Implied Probability: The chance of an event happening, based on bookmaker odds. Example: 2.00 odds = 50% implied probability.
- xG (Expected Goals): A stat that measures the quality of chances created, showing how many goals a team should score on average.
- Goal Averages: The average number of goals scored or conceded per game by a team, often used in Over/Under markets.
📈 Modelling & Analysis
- Poisson Model: A statistical model to estimate likely scorelines and probabilities based on historical goal data.
- Bayesian Models: Advanced models that update predictions as new data comes in (e.g. during a match).
- Momentum Shifts: Tracking swings in game control (possession, shots, pressure) to anticipate turning points.
💰 Betting & Trading
- Over/Under Goals: A market where you bet if a match will have more or fewer goals than a set number (e.g. Over 2.5).
- BTTS (Both Teams To Score): A market where you bet on whether both teams will score at least one goal.
- Asian Handicap (AH): A market that evens the playing field by giving one team a head start (e.g. +1 goal).
- Staking Plan: A strategy for how much to stake on each bet (e.g. level stakes, % bankroll, progressive systems).
- Liability: In exchange betting, the amount you risk when laying a bet.
📊 Trading Terms
- In-Play Trading: Placing bets while the match is live, often to profit from odds swings.
- Lay Bet: Betting against an outcome (e.g. laying a team to win).
- Back Bet: Betting for an outcome (e.g. backing a team to win).
- Cash Out: Locking in profit or reducing risk by closing a bet before the match ends.
⚖️ Safer Gambling
- Bankroll: The total money you set aside for betting.
- Limits: Maximum amounts you set to avoid over-betting.
- Stop-Loss: A rule to quit betting for the day if you lose a set amount.
Betting & Trading Terminology
- Arbitrage (Arb): Taking advantage of differing odds across bookmakers to guarantee profit.
- Closing Line Value (CLV): How your bet’s odds compare to the final odds before kickoff. Beating the closing line usually means long-term profitability.
- Overround / Vig (Juice): The bookmaker’s margin built into odds.
- Value Bet: A bet where your assessed probability is higher than the bookmaker’s implied probability.
- Dutching: Spreading stakes across multiple outcomes to lock in profit or balance risk.
- Drip Feeding: Entering the market with staggered bets rather than one lump stake.
- Hedging: Placing additional bets to secure profit or limit loss regardless of outcome.
- Yield: Profit percentage relative to total stakes.
Mathematical & Modelling Concepts
- Kelly Criterion: A staking formula that optimises bet size based on edge and bankroll.
- Regression to the Mean: The tendency for extreme results to move closer to average over time.
- Standard Deviation (SD): Measures variability (e.g., a high SD in goals means a team’s matches are unpredictable).
- Sample Size: The number of matches/events used to calculate stats — small samples = less reliable.
- Confidence Interval: A range that shows the uncertainty around a prediction.
- Bayesian Updating: Adjusting probabilities dynamically as new data (like in-play stats) arrives.
- Expected Points (xPts): Predicted league points based on xG and chance quality rather than actual results.
- Win Probability Models: Using statistical frameworks (Poisson, Monte Carlo simulations) to estimate true odds.
- Market Efficiency: How well bookmaker odds reflect true probabilities.
Football-Specific Statistics
- xGA (Expected Goals Against): The quality of chances conceded.
- NPxG: Non-penalty expected goals (removes penalties to give a clearer attacking picture).
- PPDA (Passes Allowed Per Defensive Action): A measure of pressing intensity.
- Deep Completions: Passes completed within 20m of goal (not including crosses).
- Shot-Creating Actions (SCA): Passes, dribbles, or fouls that lead directly to shots.
- Goal Conversion Rate: % of shots turned into goals.
- Save Percentage: % of shots on target saved by a goalkeeper.
- Possession Value Models (OBV, xT): Advanced models estimating how much each possession increases a team’s chance of scoring.
- Form Index: Rolling average performance metric across recent matches.
- Variance in Results vs. xG: Measuring how lucky/unlucky teams are compared to their expected performance.
Staking & Bankroll Management
- Flat Stakes: Betting the same amount every time.
- Percentage Staking: Betting a % of your bankroll per bet.
- Progressive Staking: Adjusting stakes up/down depending on wins/losses.
- Unit System: Expressing stakes as “units” to manage risk consistently.
- Stop-Loss / Stop-Win: Predefined thresholds to control risk or lock profit.
Q1: What is the Gecko Edge Betting Glossary?
The Gecko Edge Betting Glossary is a curated reference of the terms, concepts, and metrics used across modern football betting analytics. It defines everything from foundational concepts like expected value (EV) and implied probability to advanced methodology terms like Dixon-Coles correction, divergence flag, and Bayesian blending. Each entry is written to be standalone, so you can use the glossary as a quick lookup or read it through as an introductory primer.
Q2: What terms does the glossary cover?
The glossary covers four broad categories: foundational betting concepts (odds, probability, EV, edge, value, stake, return), market types (1X2, Asian Handicap, Over/Under, BTTS, correct score, half-time/full-time), analytical metrics (xG, xG+, xT, lambdas, Poisson grids, sanity score), and methodology terms (Bayesian blending, Dixon-Coles correction, divergence flag, model-market gap, league prior). Both beginner and advanced terms are included.
Q3: How should I use the glossary?
Use it as a reference alongside the rest of the Knowledge Base. When you hit a term in an article or in the Gecko Edge platform that you don’t recognise, jump to the glossary, read the definition, then return to your original context. Many definitions also link to deeper Knowledge Base articles for full methodology breakdowns. The glossary is designed to be searched and skimmed, not read end-to-end, though it works as a primer too.
Q4: Is the glossary kept up to date?
Yes. The glossary is maintained alongside the Gecko Edge model itself. As methodology evolves (new metrics added, definitions refined, weightings updated), the relevant glossary entries are revised. The current version reflects the model running across 66 competitions and the methodology applied to the +EV bet stream. New terms are added as they become relevant to the platform output or to industry-standard analytics.
Q5: Why does Gecko Edge maintain a public glossary?
Most football betting platforms use specialised language without defining it, which leaves users guessing at what specific outputs mean. Gecko Edge’s view is that bettors should be able to verify and audit every term used in the methodology and platform output, not take it on faith. A public glossary removes the jargon barrier and makes the analytical concepts behind value betting accessible to anyone willing to engage with them. It’s part of the same transparency principle as the Playbook and Knowledge Base.