Demonstration of false positive and false negative using a dichotomous cut point.  Demonstration of false positive and false negative using a dichotomous cut point. The arrow indicates the cut point of the NSA test; the solid line represents the distribution of psychosomatic complaints scores among the normals while the dash line depicts the distribution among the psychoneurotics. The shaded area below the solid line corresponds to the proportion of false positive (28.6%) and the shaded area below the dashed line denotes the proportion of false negative (10.6%) (source: Star4). A Morabia, and F F Zhang Postgrad Med J 2004;80:463-469 Copyright © The Fellowship of Postgraduate Medicine. All rights reserved.