Constructing a Common Scale Between Tests of Depression: The use of Item Response Theory for Transferring of Norms from the BDI to EBADEP-A

Makilim Nunes Baptista, Lucas de Francisco Carvalho, Ricardo Primi, Juliana Gomes Oliveira, Jon D. Elhai


This study of depression assessment aims to demonstrate the process of joint calibration and transfer standards between the internationally recognized BDI and EBADEP-A, a new instrument recently validated in Brazil. In addition to the illustration of methodological procedures, our study is intended to contribute to the elaboration of normative references for the latter instrument as an assessment of depression symptoms. We included 1666 participants divided into subgroups of patients and non-patients. The respondents answered the EBADEP-A and the Brazilian version of BDI. Data were analyzed using the Rasch-Andrich Rating Scale Model. We performed concurrent calibration of items of both instruments. Next, for each instrument we performed calibration with item parameters fixed based on prior analysis. Based on that, norms of the BDI were transfered to EBADEP-A. This procedure can be applied to any test that measures the same construct. This procedure produces a scale on the same metric.

Palabras clave

IRT; psychological assessment; humor disorders; psychometric properties; depression.

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Copyright (c) 2017 Lucas de Francisco Carvalho, Makilim Nunes Baptista, Ricardo Primi, Juliana Gomes Oliveira, Jon D. Elhai

Licencia de Creative Commons: Esta obra está registrada bajo una licencia de Creative Commons Reconocimiento 4.0 Internacional. Creado a partir de