Figure 2
From: Using scenario tree modelling for targeted herd sampling to substantiate freedom from disease
Conceptual schematic representing the process of combining targeted sampling with baseline random sampling to substantiate freedom from disease. TSis the targeted sampling component, bsRSdenotes the baseline stratified random sampling component with the sensitivity CSebsRS, cTS&bsRSis the combination of targeted and random sampling, OSeis the required overall sensitivity to demonstrate freedom from disease and Xrepresents the sensitivity of the TS component, the value of which can be calculated using eq. (4).