Upper and lower bounds on the objective function value for differing numbers of spread scenarios.

The mean values, and , of the objective function over a specified number of scenarios S, as well as their 95% confidence intervals, were calculated for a base case with the desired probability of successful eradication d = 0.5 in all scenarios (p = 1), the detection rate γ = 0.7 and the proportion of the site covered by surveys β = 1. The objective function minimized the expected program cost (i.e., F = 1) and was computed with sets of 20 independent replicates with increasing numbers of scenarios, S = 400, 800, 1200, 1800, 2400 and 3000.