Fig. 3
From: Statistical process monitoring to improve quality assurance of inpatient care
Simulation of RA-CUSUM. Percentage of RA-CUSUM charts signalling a process deterioration (alarm rate) from 2000 simulated in-control (top) and out-of-control (bottom) for risk-adjusted indicator 11724. RA-CUSUM runs were simulated for mixed, low and high risk populations. The desired false alarm probability is marked by black symbols. a In-control signal rate. b Out-of-control signal rate