Rasch Scaling of a Screening Instrument | Zendy

Kathrin Maurer | Zendy; Heinz Häfner | Zendy

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Rasch Scaling of a Screening Instrument

Author(s) -

Kathrin Maurer,

Heinz Häfner

Publication year - 2014

Publication title -

sage open

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.357

H-Index - 32

ISSN - 2158-2440

DOI - 10.1177/2158244014545326

Subject(s) - rasch model , polytomous rasch model , psychology , scale (ratio) , psychometrics , checklist , psychosis , reliability (semiconductor) , clinical psychology , construct validity , schizophrenia (object oriented programming) , item response theory , developmental psychology , psychiatry , cognitive psychology , power (physics) , physics , quantum mechanics

The ERIraos Checklist (CL) is a screening instrument for assessingpsychosis risk. Measuring CL data on a Rasch scale means that this scale locatesindividuals on a dimension of “proximity to psychosis onset” according to their currentprodromal status. The probabilistic Rasch model leads to interval (difference) scales.The CL data from the German Research Network on Schizophrenia (GRNS) study were analyzedusing the Rasch program Winsteps. All item measures based on data from different patientgroups were consistent with the Rasch model. Examples demonstrate how item parameterswere comparable in different subgroups and in patients in the early and late prodrome.The CL is a simple assessment tool fulfilling the requirements of a Rasch scale. Thisguarantees good psychometric properties, such as a high reliability and internalvalidity, and yields a measure of the construct “proximity to psychosis onset” on adifference scale

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