What is exact-strike edge?
Exact-strike edge is the arithmetic difference between a priced reference market's no-vig probability and a target pick'em offer's break-even probability for the same player, statistic, event, side, and line.
It answers: “At this identical threshold, how much higher or lower is the reference market's implied probability than the probability required by the target payout?” It does not forecast the player's stat total or estimate the value of moving from one strike to another.
The calculation, step by step
- Read both reference prices. PROPD needs higher and lower prices at the comparison strike.
- Convert odds to raw implied probabilities. Each published price becomes a break-even percentage.
- Remove reference margin. Divide each raw side by their sum to create proportional no-vig probabilities totaling 100%.
- Determine the target break-even probability. Use the target offer's published price or applicable payout economics.
- Subtract. Reference no-vig probability minus target break-even probability produces the displayed percentage-point edge.
Example: if a reference market implies 53.2% no-vig for higher 7.5 rebounds and the matching target higher selection requires 50.0% to break even, the displayed edge is +3.2 percentage points.
The difference between 53.2% and 50.0% is 3.2 percentage points. PROPD's edge label describes this direct probability difference.
What must match?
| Field | Requirement | Why |
|---|---|---|
| Player | Same normalized athlete | Names can vary, but the person cannot. |
| Event | Same game or contest | A season or later event is a different outcome. |
| Market | Same stat and settlement definition | Points is not points + assists. |
| Side | Higher compared with higher; lower with lower | The outcomes are complements, not substitutes. |
| Strike | Exact numeric match | 6.5 and 7.5 require different player results. |
| Reference | Two usable sides | Both are required for transparent margin removal. |
When data is missing, ambiguous, stale, one-sided, or contradictory, PROPD keeps that state visible. An unavailable calculation is more honest than a precise-looking number unsupported by the inputs.
Why PROPD does not price line mismatches
Suppose the target line is 5.5 assists and the reference line is 6.5. The reference price describes the probability of reaching seven; the target outcome may require only six. Converting that gap into a percentage requires assumptions about the probability mass at six assists.
Those assumptions are a model. PROPD's core comparison is deliberately model-free, so it reports the more favorable strike as directional line value and withholds an edge percentage. This avoids smuggling a hidden distribution into what is presented as published-market arithmetic.
| State | PROPD output |
|---|---|
| Exact strike, valid two-sided prices | Percentage edge plus source and evidence label |
| Mismatched strikes | Line difference / directional value; no percentage edge |
| One-sided reference | Published quote remains visible; no no-vig calculation |
| No usable comparison | Explicit unavailable state |
Edge and evidence are separate
A computed edge says how far two implied probabilities differ. It does not say how trustworthy the supporting market is. PROPD therefore keeps evidence strength separate from edge size.
- Multi-source exact agreement means several eligible references support the same exact-strike direction.
- Single-source exact price means the calculation is valid but depends on one reference.
- Cross-market disagreement means usable sources point in materially different directions.
- Line value only means strikes differ and the board shows the directional line advantage without estimating probability.
Freshness, market limits, liquidity, lineup news, and quote timing can all affect evidence. The board exposes what it can, but no label eliminates uncertainty.
How to interpret a displayed edge
A positive value means the reference market's no-vig probability is higher than the target's break-even probability for that exact outcome. A negative value means it is lower. Zero means the two are aligned after normalization.
The number is a market comparison, not a recommendation, projection, or guarantee. It may change as prices move. Always verify the target line, payout, and platform rules before making a decision, and treat responsible-play limits as more important than any market signal.
Audit the math yourself
Open a market row in PROPD to see strikes, published prices, no-vig probabilities, sources, and evidence states together.
Explore the live market board