P95 lateness
The 95th-percentile late arrival time for a delivery cohort. Captures tail risk that average on-time rate hides. The number your worst-served customers actually experience.
P95 lateness is the 95th-percentile late arrival time across a delivery cohort. Where average on-time rate hides the tail — a 97% on-time service can have wildly different P95s — P95 lateness exposes how bad the worst 5% of deliveries actually were.
Customers experience the tail more than they experience the average, so SLA contracts increasingly cite P95 thresholds rather than aggregate on-time percentages.