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Fig. 4 | BMC Health Services Research

Fig. 4

From: Development and evaluation of the measurement properties of a generic questionnaire measuring patient perceptions of person-centred care

Fig. 4

Item characteristic curves of items 13 and 16 (when item 18 has been deleted) The grey curves represent the expected item responses and the black dots the observed item responses with patients grouped into nine class intervals based on similar person locations. Panel a shows item 13 with a large positive residual (4.753) and dots that deviate from the expected curve creating a flatter pattern. Panel b shows item 16 with an opposite pattern with a large negative residual (−2.832) and a pattern that is steeper than the expected curve

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