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A psychometric validation of the beliefs toward mental illness scale
Background And Purpose:
This study measured Protestant Christians' beliefs about mental illness using the Beliefs Toward Mental Illness Scale (BMI).
Methods:
This study used a state-of-the-art item response theory technique, namely the Rasch rating scale model (RRSM), to evaluate the psychometric properties of the BMI and to produce a ruler of the construct hierarchy.
Results:
Using Messick's framework for evaluating construct validity, sufficient evidence was obtained that suggests the BMI is psychometrically sound regarding substantive, content, structural, and generalizable aspects of validity.
Conclusions:
The BMI is a psychometrically sound instrument that is appropriate for measuring beliefs toward mental illness.
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