Title
A method for ordinal outcomes: The ordered stereotype model
Date Issued
01 December 2019
Access level
open access
Resource Type
journal article
Author(s)
University of Queensland
Publisher(s)
John Wiley and Sons Ltd.
Abstract
Objective: The collection and use of ordinal variables are common in many psychological and psychiatric studies. Although the models for continuous variables have similarities to those for ordinal variables, there are advantages when a model developed for modeling ordinal data is used such as avoiding “floor” and “ceiling” effects and avoiding to assign scores, as it happens in continuous models, which can produce results sensitive to the score assigned. This paper introduces and focuses on the application of the ordered stereotype model, which was developed for modeling ordinal outcomes and is not so popular as other models such as linear regression and proportional odds models. This paper aims to compare the performance of the ordered stereotype model with other more commonly used models among researchers and practitioners. Methods: This article compares the performance of the stereotype model against the proportional odd and linear regression models, with three, four, and five levels of ordinal categories and sample sizes 100, 500, and 1000. This paper also discusses the problem of treating ordinal responses as continuous using a simulation study. The trend odds model is also presented in the application. Results: Three types of models were fitted in one real-life example, including ordered stereotype, proportional odds, and trend odds models. They reached similar conclusions in terms of the significance of covariates. The simulation study evaluated the performance of the ordered stereotype model under four cases. The performance varies depending on the scenarios. Conclusions: The method presented can be applied to several areas of psychiatry dealing with ordinal outcomes. One of the main advantages of this model is that it breaks with the assumption of levels of the ordinal response are equally spaced, which might be not true.
Volume
28
Issue
4
Language
English
OCDE Knowledge area
Estadísticas, Probabilidad
Subjects
DOI
Scopus EID
2-s2.0-85073923578
PubMed ID
Source
International Journal of Methods in Psychiatric Research
ISSN of the container
10498931
Sources of information:
Directorio de Producción Científica
Scopus