BASE RATE COUNT WORKSHEET
Learning Cadence | Original worksheet | 18 October 2026

Population and time period:
Source of each rate:
Total cases N:
Cases with event E = N x base rate:
Cases without event = N - E:
True positives = E x detection rate:
False positives = (N - E) x false-positive rate:
All positives = true positives + false positives:
Event given positive = true positives / all positives:
Assumptions and uncertainty:
Check: are both rates applicable to this population?