3.6.3.4. Data analysis

The data are analysed using the probit transformation. The natural mortality rate is taken into account using the iterative approach, according to Finney (1949). The concentrations which kill a given proportion of mites and their fiducial limits are computed according to Finney (1971). Refer to the BEEBOOK paper on toxicological methods (Medrzycki et al., 2013) for these calculations.