Variance
A measure of how widely results spread around the expected value. High for straight up, low for even-money bets.
In context
Var per unitmoneyUnitThe base stake a system or a player works in. Progressions are described in units so they apply at any table.Read full → = p·W² + (1 − p) − EV². About 34 for a straight upbetStraight upA single number, pays 35:1.Read full →, about 1 for redbetRedEven-money bet on the 18 red numbers. French: rouge.Read full →, with the same expected lossmathExpected lossExpected value times total amount wagered; the average amount lost over a session or a period.Read full →.
A session of straight-up bets can finish up several hundred dollars while a red-betting neighbor finishes down $20, and both players experienced exactly the same house edgemathHouse edgeThe share of each stake the casino keeps on average: 2.70% in European roulette.Read full →.