Biomedical Engineering Reference
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Fig. 8.50 OIP product w9k001 : OC curve ( dashed green line ) and results for stage group 2; black
symbols are correct decisions; blue symbols are false rejections (type I errors). Outcomes and the
OC curve are based on the combined results of all three groups. The OC curve for LPM / SPM ratio
is superimposed for comparison
Fig. 8.51 OIP product w9k001 : OC curve ( dashed green line ) and results for stage group 3; black
symbols are correct decisions; blue symbols are false rejections (type I errors). Outcomes and the
OC curve are based on the combined results of all three groups. The OC curve for LPM / SPM ratio
is superimposed for comparison
that produces errors well away from regions near the limits (and thus in the areas of
clearly acceptable or clearly unacceptable quality). This can be seen in the shape of
the OC curves. Incorrect decisions which only occur near the boundaries of the
acceptance region produce an OC curve with relatively steep sides and a flat top
across the major portion of the acceptance region. This contrast can be observed in
the figures by comparing the shapes of the OC curves and the pattern of incorrect
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