This approach treats each measured residue concentration as a population with a mean (the residue concentration) and a distribution described by the normal curve with a relative standard deviation (sr) representing the variability among replicate plots within a supervised field trial. We add the individual populations to produce a population for the set of supervised residue trials, i.e., a population of sub-populations (POSP), which expresses the incidence as a function of residue concentration. The 95thpercentile then corresponds to the residue dividing the area between the top 5% and the remaining 95%.Replicate data may be directly included in the calculation by a weighting system. POSP estimates were surprisingly closely related to OECD method estimates, 95th percentile = 0.809 X (OECD estimate), R2 = 0.995, n = 91.

MRL calculations based on both intra- and inter-trial residue variability

248th National Meeting (2014)

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