Compare percentages only after matching the denominator.
Why two accurate percentages can still create a misleading comparison when their denominators differ.
Initial-wager house edge
Expected casino win divided by the initial wager. This is common for table-game summaries and naturally incorporates later conditional action into the numerator.
Element of risk
Expected loss divided by average total amount risked. It can look smaller for games requiring later raises even when the expected loss per initial round is unchanged.
RTP
Return to player is one minus house edge only when the same wager base and model are used. Slot RTP normally uses total coin-in, not cash inserted.
Worked example
If a round starts with $10, adds an average $20 later and loses $0.20 on average, the initial-wager edge is 2% while element of risk is about 0.667%. Both describe the same expected loss.
Publishing standard
Casino Calculated labels the numerator, denominator, rules and strategy. Percentages without those fields are treated as incomplete.
Evidence record
The exact rules, wager schedule and stated strategy.
Expected value is the probability-weighted sum of net outcomes.
Examples illustrate method; posted casino rules control.