Glossary
Projection
A model-driven estimate of a player’s expected outcome for a specific stat.
Prop Line
The posted threshold for a player stat (e.g., points, rebounds) used as a reference.
Expected Value (EV)
A concept that compares probability to price to estimate long-term value.
Implied Probability
The probability suggested by an odds price after accounting for format (American/Decimal).
American Odds
A common odds format using positive/negative numbers to indicate payouts and risk.
Decimal Odds
Odds format showing total return per 1 unit staked (e.g., 1.90).
Over/Under
A prop that pays based on whether a player goes over or under a listed stat line.
Juice (Vig)
The built-in pricing margin on a line, reflected in odds.
Line Movement
Changes in the posted line or price over time.
Projection Error
The difference between a model’s projection and the actual outcome.
Variance
The expected spread of outcomes around a projection.
Volatility Tier
A label that summarizes how consistent a player’s outcomes have been recently.
Sample Size
The amount of data used to support a trend or projection.
Usage Rate
How often a player is involved in a team’s offensive possessions.
Pace
The estimated number of possessions or plays in a game, impacting volume stats.
Matchup
Context about opponent strength, defensive tendencies, or positional matchup.
Injury Status
Availability classification that can affect projections and expected roles.
Trend
A recent pattern in performance that may influence projections.
Median vs. Mean
The median is the middle outcome; the mean is the average. They can differ in skewed distributions.
Correlation
How two outcomes move together, important when combining props.
Parlay
A combined bet where multiple legs must all succeed for a payout.
Alt Line
An alternate stat line offered at a different price.