What it means
For decimal odds O and estimated probability p, the simplified formula is p × O − 1. A positive result depends on p; if p is invented or viewed after the result, the conclusion has no practical value.
Odds and data
Expected value: estimated probability versus price
A discussion of value starts only when you have an estimated probability, an available odd and a way to verify it over time.
Example
If someone estimates a 45% chance at odds of 2.40, the calculation is 0.45 × 2.40 − 1 = 0.08. That is a +8% hypothesis, not confirmation of the wager.
Watch out for
A winning bet does not prove value, and a losing bet does not disprove it on its own. You need estimates made before the result and a sufficient sample.
Educational content, not betting advice. Odds do not remove risk; check the operator's rules and stop if gambling is no longer fun or controlled.
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