Achieved sensitivity obtained from different allocations of the 600 units when the prevalence in each line varies so that the overall prevalence is 0.5%. The solid black line corresponding to a proportional split is always greater than the desired sensitivity. For non-proportional allocation, the sensitivity is sometimes greater and sometimes less than desired.
Part of: Lane SE, Cannon RM, Arthur AD, Robinson AP (2019) Sample size for inspection intended to manage risk within mixed consignments. NeoBiota 42: 59-69. https://doi.org/10.3897/neobiota.42.29757