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Figure 1 | Health and Quality of Life Outcomes

Figure 1

From: Item response theory and factor analysis as a mean to characterize occurrence of response shift in a longitudinal quality of life study in breast cancer patients

Figure 1

Variable response categories according the first two axes obtained by Multiple Correspondence Analysis between prospective measure of role functioning at baseline and retrospective measure after surgery (N = 84). Questions 6 and 7 of the EORTC QLQ-C30 measure this dimension: Qi_k (or Ri_k) refers to the k-th category of the i-th item of a prospective (or retrospective) questionnaire on the graph. Patients are represented by circles that are proportional to the number of patients with the same coordinates (i.e. who had given the same responses).

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Health and Quality of Life Outcomes

ISSN: 1477-7525

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