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Assessing Proportionality in the Proportional Odds Model for Ordinal Logistic Regression

1990/12/01 by Rollin Brant · 60 citations
Mathematics · Decision Sciences · #Statistical Methods and Bayesian Inference #Advanced Statistical Methods and Models #Optimal Experimental Design Methods

paper · doi:10.2307/2532457

Abstract

The proportional odds model for ordinal logistic regression provides a useful extension of the binary logistic model to situations where the response variable takes on values in a set of ordered categories. The model may be represented by a series of logistic regressions for dependent binary variables, with common regression parameters reflecting the proportional odds assumption. Key to the valid application of the model is the assessment of the proportionality assumption. An approach is described arising from comparisons of the separate (correlated) fits to the binary logistic models underlying the overall model. Based on asymptotic distributional results, formal goodness-of-fit measures are constructed to supplement informal comparisons of the different fits. A number of proposals, including application of bootstrap simulation, are discussed and illustrated with a data example.

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