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Fig. 1 | BMC Psychiatry

Fig. 1

From: Searching for the optimal number of response alternatives for the distress scale of the four-dimensional symptom questionnaire

Fig. 1

Category response curves (CRCs; 0–4) and item information curve (straight line) Item 17, Feeling down or depressed (GP clients). X-axis: Position on the latent distress continuum; left y-axis: Probability of endorsement; right y-axis: Information provided by item 17. The straight line depicts the information provided by this item conditional on theta (x-axis). The other lines depict the CRCs for this item, that is the probability of endorsing a specific response category, conditional on theta: 0: ‘Not present’, 1: ‘Sometimes’, 2: ‘Regularly’, 3: ‘Often’, & 4: ‘very often / constantly present’

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