AP Glossary
WhatIsThreshold?
The specific meter value or counter level at which a machine transitions from -EV to +EV. Run the Slots calculates trigger thresholds for every supported machine based on base game return, meter rates, and bonus values.
Why It Matters
Why this matters for advantage play
The threshold is the actionable output of every AP calculation. Below threshold, walk past; at or above threshold, sit down. Knowing thresholds for the games you target is what lets a floor walk produce decisions instead of guesses.
Cross-Reference
Related terms
EV (Expected Value)
The mathematical average outcome of a bet calculated over infinite repetitions. Positive EV (+EV) means the play is profitable long-term; negative EV (-EV) means the house has the edge. AP players only take +EV plays.
Trigger
The specific condition that activates a bonus feature or progressive payout. In AP context, the trigger point is the threshold where playing the machine becomes mathematically profitable.
Ceiling
The maximum value a must-hit-by progressive can reach before it is guaranteed to pay out. The closer a progressive gets to its ceiling, the higher the expected value of playing that machine.
Midpoint Method
A calculation technique for MHB progressives that estimates the breakeven point by finding the statistical midpoint between the current meter value and the ceiling. Assumes uniform trigger distribution — in practice, some games may be biased toward triggering near the ceiling.
Frequently Asked
Common questions about threshold
Approximately, but small differences in certified RTP version, denomination, and progressive contribution can shift thresholds by 5–20%. Verify per property if you're playing at the margin.
Threshold meter values usually don't change with bet level (the math is about the meter, not your bet), but expected cost to trigger does scale with bet.
Most published thresholds are accurate to within a few percent. They're conservative on purpose — leaving a small margin keeps the play +EV even when assumptions drift.
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