Survivorship = (1 - churn) With this definition, a churn of 0.75 is a survivorship of 0.25. You're perhaps being misled by the offhand phrase "the survivorshi

Survivorship = (1 - churn) With this definition, a churn of 0.75 is a survivorship of 0.25. You're perhaps being misled by the offhand phrase "the survivorship is the inverse of the churn"; in that sentence "inverse" is not being used in the mathematician's strict sense of "reciprocal", but in the more colloquial sense of "a thing that moves in the opposite direction from the previous thing". None of us understand where 32 months came from.