🧪 The Lab Glossary

An evolving index of every term, concept, and inside joke from The Lab Notes series.
Current through → Lab Notes #10 — Why +EV Bets Still Lose (and Keep Losing)

🎬 Welcome to The Glossary

Every experiment in The Lab leaves chemicals behind — words, phrases, and ideas we’ll keep using as we go.
This page collects them in one place — from serious formulas to late-night analogies.
Bookmark it, revisit it, and watch it grow as new Labs drop.

🎭 Core Betting Concepts

Favorites (Lab Notes #1) — Expected winners. Shown with negative odds (–). Risk more to win less.
Underdogs (Lab Notes #1) — Expected losers. Shown with positive odds (+). Risk less to win more.

Odds (+ / –) (Lab Notes #1) — The sportsbook’s price tags.
– = you’re paying extra for safety.

+= you’re being paid extra for risk.

Even Odds (+100) (Lab Notes #1 → reinforced in Lab Notes #2) —
True coin flip. Bet $100 → win $100.

Implied Probability (Lab Notes #2) —
The hidden percentage inside every line. Converts odds into a real-world chance.

True Odds (Lab Notes #3) —
The clean, vig-free version of a betting line — what the odds should be before the book adds its fee.

Break-Even Percentage (Lab Notes #3) —
The win rate required just to not lose money at a given price. At −110 you need 52.38%, not 50%.

Line Shopping (Lab Notes #3) —
Comparing multiple books to pay the minimum vig. Like checking gas stations, but the fuel is your bankroll.

Opening Line (Lab Notes #4) —
The first number the sportsbook posts. Not a prediction — an asking price, like putting your house on the market to “see who bites.”

Line Movement (Lab Notes #4)—
When the number changes because money, news, or hype hits the market.
The board basically whispers: “People have opinions.”

Market Overreaction (Lab Notes #4) —
When bettors chase headlines instead of logic, pushing the line farther than the information deserves.

Moneyline (Lab Notes #5) —
A bet on which team wins the game outright. No points or margins — just win or lose. The more “certain” the outcome, the worse the payout.

Spread (Lab Notes #5) —
A bet on the margin of victory. One team gives points, the other gets them, turning mismatches into near coin flips built for efficiency.

Total (Over/Under) (Lab Notes #5) —
A bet on the combined score of both teams. You’re not picking sides — you’re betting how the game behaves: pace, efficiency, weather, and flow.

Closing Line (Lab Notes #5) —
The final price or number before a game starts, shaped by news, public money, and sharp action. Often the most efficient version of the market.

Usage Window (Lab Notes #6) —
The realistic opportunity a player has to produce stats — driven by role, game script, play calling, and how often the ball actually flows through them.

Sharp Book (Lab Notes #8) —
A sportsbook that takes large, professional bets and moves its lines quickly in response to informed money. Its prices are the closest thing we have to the market’s true opinion.

Soft Book (Lab Notes #8) —
A sportsbook built for volume and entertainment — promos, boosts, parlays, and public action — where lines move slower and pricing mistakes last longer.

Vig-Stripped Probability (Fair Odds) (Lab Notes #8) —
The true percentage chance of an outcome after removing the sportsbook’s built-in tax. This is what sharp markets actually believe before the house takes its cut.

Projection (Lab Notes #9) —
A data-driven estimate of what a player or team is expected to produce, built from inputs like role, minutes, pace, matchup, and environment — not from recent box scores alone.

Usage Window (Lab Notes #9) —
The realistic range of opportunities a player has to accumulate stats, determined by role, game script, and how often the offense actually flows through them.

💵 Value & Psychology

Price Tag Mentality (Lab Notes #1) —
Odds reflect value, not prediction.
You’re not betting who’s better — you’re shopping for mispriced probabilities.

Risk vs. Reward (Lab Notes #1) —
Big payout = small chance.
Small payout = high chance.

Odds = Price = Payout (Lab Notes #1) —
Sportsbooks don’t predict the future.
They sell prices on possible outcomes.

Value Bet (Lab Notes #2) —
When your probability is higher than the book’s implied probability.
Where edge lives.

Price Translation (Lab Notes #2) —
Turning odds into percentages so you can evaluate the true cost of a bet.

Forecast Line (Lab Notes #2) —
Odds as prediction, not promise — like the weather report of sports.

Vig (Vigorish) (Lab Notes #3) —
The sportsbook’s invisible tax on every bet — the hidden edge baked into every line.

Expected Value — EV (Lab Notes #3) —
A calculation that measures whether your bet is profitable after accounting for the vig.
Positive EV = beating the book.
Negative EV = paying tuition.

Human Layer (Lab Notes #6) —
The part of betting models can’t fully capture — psychology, motivation, fatigue, coaching decisions, and how players actually behave in real time.

Fragile Markets (Lab Notes #6) —
Small betting markets (like props) that move quickly when new information appears because they’re shaped by less money and fewer guardrails.

Smaller Pond Effect (Lab Notes #6) —
The idea that in prop markets, fewer bets can create bigger line movement, making prices more reactive and less stable than major markets.

True Probability Gap (Lab Notes #7) —
The difference between what should happen (your estimated true probability) and what the sportsbook is charging for. This gap — not the outcome — is where long-term profit lives.

Long-Run Expectation (Lab Notes #7) —
The result you’d expect after repeating the same decision hundreds or thousands of times. Short-term results are noise; long-run expectation is signal.

Price Sensitivity (Lab Notes #7) —
How much a bet’s quality changes when the odds move. Some bets are playable only at one number — one tick worse and the edge disappears.

Variance (Lab Notes #8) —
The natural swing between correct decisions and short-term results. Even perfectly priced bets will lose sometimes — that randomness is the entry fee for long-term profit.

Drawdown (Lab Notes #10) —
A period where results fall below previous peaks despite correct decision-making. Drawdowns are not proof of failure — they’re an unavoidable part of exploiting edge.

Outcome Bias (Lab Notes #10) —
The tendency to judge a decision solely by whether it won or lost, rather than by whether it was priced and executed correctly.

Process Integrity (Lab Notes #10) —
The discipline to continue making the same high-quality decisions regardless of short-term results. Process integrity is what allows edge to survive variance.

🌮 Lab Slang & Humor

2 A.M. Sushi Bet (Lab Notes #1) —
A reckless long-shot wager that feels brilliant in the moment and ages like gas-station seafood. Usually +250 or worse.

Grocery Store Tacos (Lab Notes #1) —
Safe, predictable favourites. You’ll win sometimes, but you’ll overpay.

Street Taco Line (Lab Notes #1) —
Slightly risky underdog at the perfect price. Worth testing.

David vs. Goliath Matchup (Lab Notes #1) —
Underdog vs favourite. Everyone roots for David. Most bettors still choose Goliath.

Cage Probability (Lab Notes #2) —
When the model says “no,” but your gut says “Nick Cage energy.”

Bachelor Rose Bet (Lab Notes #2) —
You know the math says +250 and no chance…
but you swear there’s “a connection.”

Raccoon Game (Field Study #1) —
A game so sloppy you’re not betting football anymore — you’re betting chaos.

The French Fry Tax (Lab Notes #3) —
Prop Lab slang for the vig: the handful of fries the sportsbook steals before you even sit down.

The Guac Principle (Lab Notes #4) —
Prop Lab slang for overpriced public sides.
When everyone orders the same thing, the price mysteriously goes up.
Guac costs extra. So do popular bets.

Friday Night Number (Lab Notes #5) —
The line you’re staring at on your couch after professionals already grabbed the good version earlier in the week — clean, polished, and ready to humble you.

Narrative Gravity (Lab Notes #6) —
The invisible force that pulls bettors toward a story they want to be true — even when the math is begging them to step back.

Screenshot Bias (Lab Notes #7) —
The belief that a bet was “good” because it won and was screenshot-worthy, even if it was badly priced — often followed by silence when the same logic loses five times in a row.

Phone-Case Pricing (Lab Notes #8) —
When the same outcome is sold at wildly different prices across books, like identical phone cases at three mall kiosks — the product didn’t change, only how hard someone’s trying to rip you off.

Spreadsheet Confidence (Lab Notes #9) —
The sudden and unjustified belief that a bet must be correct because it came from a spreadsheet — usually followed by defending the model instead of questioning the assumptions.

Fast & Furious Syndrome (Lab Notes #10) —
The irresistible urge to chase losses with louder, riskier bets because “this one feels different” — usually right before the bankroll learns a lesson.

🔥 Environment & Game Flow

Game Environment (Field Study #1) —
The overall “climate” of a matchup — pace, scoring oxygen, explosiveness.

GES (Game Environment Score) (Field Study #1) —
Prop Laboratory rating (0–100) that measures how breathable the game is for props.

Pace (Field Study #1) —
How fast plays happen.
Faster pace = more opportunities.

Explosiveness (Field Study #1) —
How often chunk/big plays occur.
Creates ceiling outcomes.

Rock Fight (Field Study #1) —
Slow, ugly, low-scoring environment. Pain.

Pinball Game (Field Study #1) —
Fast, chaotic, high-scoring environment. Joy.

🧪 Lab Philosophy

Price Always Matters (Lab Notes #1) —
The Lab’s Prime Directive.
Even when the tacos are mid, the price determines the play.

Testing props. Finding profits. (Core Lab Identity)
We don’t post opinions — we post edges.

Read the Receipt (Lab Notes #2) —
Lab slang for “convert odds to probability.”
Don’t guess what a line means — calculate it.

Distribution Thinking (Lab Notes #7) —
Evaluating outcomes as a range of possibilities rather than a single prediction. Betting isn’t about being right once — it’s about being positioned well across many possible results.

Assumption (Lab Notes #9) —
A belief built into a model about how the game will behave (minutes, usage, role stability, health). Bottom-up EV lives or dies on whether these assumptions hold.

Model Drift (Lab Notes #9) —
The gradual loss of accuracy that occurs when a model isn’t updated as roles, rotations, or team tendencies change over the season.

📘 Latest & Upcoming Labs

Latest Lessons:

(More will be linked here as they publish.)

⚗️ About This Glossary

New Labs = new terms = glossary update.
Consider this your dictionary of edgeucation.

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