Abbildung 1: A Youden plot of sperm concentration. For a given distribution, the results of the assessments of each centre for Sample A (abscissa) is plotted against the assessments of the same centre for Sample B (ordinate). The target ranges for the concentration in each sample (provided by reference centres) is shown between the dotted lines on each axis
and they overlap to define the target window (solid line). The positions of points outside the target window indicate random errors (R) or systematic
errors (S). The graph is thus divided into 9 areas and Ranks are awarded for falling within the target window (Rank 1), for having random errors (Rank 2 in R2), systematic errors (Ranks 3 in S3) and extreme random errors (Rank 4 in R4).