Category response curves for the ra

Category response curves for the rating scale. Probability of response for the three response categories (Y axis) along the latent variable
(severity of symptoms) minus the item difficulty (X axis). (B) Personeitem map for the 16-item CVS questionnaire. Difficulties of the items and
scores of the subjects are plotted together: on the right of the dashed line, the items; on the left, the subjects. (Each # in the person column represents
three persons, and each dot represents one to two persons.) From top to bottom: from highest to lowest severity of symptoms. The figure also
includes (superimposed) the curve of the standard error function of the questionnaire scores.