Week 02 of 12
Volatility Coefficient Matrix
8 min read
Two games can return the same percentage over a million spins and destroy you at completely different speeds. Volatility is the shape of the ride, and it decides how much bankroll a given return actually requires.
Return and variance are separate numbers
Return to player describes the long-run average. Variance describes how far individual sessions scatter around it. A 92% low-variance game grinds; a 92% high-variance game pays almost nothing for hours and then hands back a lump.
Nothing in a session's result tells you which number you were sampling. A winning night on a bad game is still a bad game.
Reading distribution from the pay table
Look at where the money sits. If the top two combinations account for most of the theoretical return, the game is top-heavy and volatile. If the return is spread across small line hits and frequent bonuses, it is a grinder.
Hit frequency without average win size is meaningless. A game hitting 40% of spins that returns less than the bet on most hits is bleeding you slowly.
Sizing bankroll to volatility
A rough working rule: low-variance games need roughly 100 to 200 times your bet in session bankroll, high-variance hold-and-spin games need 300 to 500, and top-award chasing needs more than most people bring.
Under-rolled play on a volatile game is the most common way a mathematically sound plan still ends in ruin. Week 9 formalises this.
This week on the floor
- · For your next three sessions, record the game and the denomination, then compare the net result recorded for each.
- · Classify each game you play as grinder, mid, or top-heavy before you sit down.
- · Bring a session bankroll that matches the class, not the mood.
Choose the volatility you can fund, not the one you can imagine.