State of the psychometric methods: comments on the ISOQOL SIG psychometric papers.

J Patient Rep Outcomes · 2019 · PMC6663952 · PMID 31359221

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an increasing trendno p-value reported

However, the IRT analysis supports the conclusion that the response categories are not disordered: the discrimination parameters show an increasing trend and the depression score estimate based on the category “sometimes” (1.22) is clearly higher than the estimate based on the category “rarely” (0.57).

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