In the property saved model, which expression represents the property saved index?

• A. PS / (PS + PL + PUF)
• B. PS / (PS + PL)
• C. PS / (PS + PUF)
• D. PS / (PS + LUF)

Answer: (A)

The property saved index measures how often a property is actually saved out of all possible save-related outcomes. If PS represents the amount or probability of a saved property, and PL and PUF represent the other outcomes (property lost and property unsafely failed to save), then the correct index is PS divided by the total of all these outcomes: PS / (PS + PL + PUF). This ratio captures the share of successful saves among every save attempt, giving a value between 0 and 1.

The other expressions omit one of the possible outcomes in the denominator, which would misrepresent the true likelihood of a successful save because they don’t account for all the ways a save can fail or be lost.