Which model uses PS in the numerator?

Which model uses PS in the numerator?

• A. Property saved model
• B. Maritime danger model
• C. Lives saved model
• D. IS-based model

Answer: (A)

The main idea is that what sits in the numerator shows what outcome you’re counting. If PS stands in the numerator, you’re counting properties saved. That means the metric is framed around how many properties were saved relative to those at risk, which is exactly what the property saved model measures. This aligns with the purpose of that model: it focuses on preserving property, not lives or other factors. In other models, the numerator would represent different outcomes—lives saved for a lives-focused model, for example—so PS wouldn’t appear there. So, when PS is used in the numerator, it signals the property saved model, the one that quantifies the fraction of properties saved. For instance, if 30 properties are saved out of 50 at risk, you’re looking at PS in the numerator over the total at risk in the denominator, yielding a savings proportion.

The main idea is that what sits in the numerator shows what outcome you’re counting. If PS stands in the numerator, you’re counting properties saved. That means the metric is framed around how many properties were saved relative to those at risk, which is exactly what the property saved model measures.

This aligns with the purpose of that model: it focuses on preserving property, not lives or other factors. In other models, the numerator would represent different outcomes—lives saved for a lives-focused model, for example—so PS wouldn’t appear there.

So, when PS is used in the numerator, it signals the property saved model, the one that quantifies the fraction of properties saved. For instance, if 30 properties are saved out of 50 at risk, you’re looking at PS in the numerator over the total at risk in the denominator, yielding a savings proportion.