The Lab Library
Learn
Plain-English guides to reading a bet the way the Lab does. The math the books don’t itemize: correlation, the SGP tax, fair prices, trap legs. Taught for people betting their first season, no stats degree required.
Parlays & Correlation
How to Check If a Parlay Is Actually Good Before You Bet It
The 4-step pre-bet checklist: standalone leg value, correlation, payout math, and trap legs. Run it on any slip before the money leaves your account.
Read it →
Parlays & Correlation
What Is the SGP Tax? The Correlation Tax on Same-Game Parlays, Explained
The gap between what your parlay would pay if the legs were independent and what the book quotes, with the napkin math worked out step by step.
Read it →
Parlays & Correlation
Same-Game Parlay Correlation: Why Your SGP Quietly Loses (and How to Spot It)
Positive vs. negative correlation, the 15–25% hidden hold on SGPs, and how to spot legs that move together before you lock them.
Read it →
ET Parlays is sports-analytics research and decision-support, not a sportsbook, and never a promise of a winning bet. New guides land as they’re written.