Application of the Rasch Rating Scale Model to the Obsessive-Compulsive Symptoms Inventory

Authors

  • Joana Rosa Lusófona - University of Humanities and Technology, Lisbon, Portugal.
  • Ana R. Delgado University of Salamanca.
  • Gerardo Prieto University of Salamanca.
  • Américo Baptista Lusófona - University.
  • Paulo Lopes Lusófona - University.

DOI:

https://doi.org/10.14195/1647-8606_59-1_5

Keywords:

obsessive-compulsive symptoms, Rasch model, response categories, psychometric study

Abstract

The purpose of this study was to analyse, using the Rasch Rating Scale Model, an instrument of obsessive-compulsive symptoms (ISOC), presented in 2008 by Rosa and Baptista, that consists of 105 items of characteristic symptoms of obsessive-compulsive disorder. Two hundred and twenty subjects (87 diagnosed with OCD and 133 without this disorder) undertook the ISOC (Rosa & Baptista, 2008) and the SCL-90-R (Derogatis, 1977).     It was confirmed that the response categories were adequate, although 27 items had to be removed since they showed differential functioning between groups (with OCD/ without OCD) and/or sex. The final version of the inventory consists of 78 items with five response categories that have met the criteria set (Linacre, 2002) and shows adequate psychometric qualities. Thus, the results obtained indicate that the ISOC is a reliable, valid and useful measure, useful as a screening instrument to assess obsessive-compulsive symptoms.

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Published

2017-01-02

How to Cite

Rosa, J., Delgado, A. R., Prieto, G., Baptista, A., & Lopes, P. (2017). Application of the Rasch Rating Scale Model to the Obsessive-Compulsive Symptoms Inventory. Psychologica, 59(1), 77-93. https://doi.org/10.14195/1647-8606_59-1_5

Issue

Vol. 59 No. 1 (2016)

Section

Articles

License

Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows sharing the work with recognition of authorship and initial publication in Antropologia Portuguesa journal.