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Activity Number: 348
Type: Contributed
Date/Time: Tuesday, August 5, 2014 : 10:30 AM to 12:20 PM
Sponsor: Section on Statistics in Epidemiology
Abstract #312347 View Presentation
Title: Novel Application and Investigation of Oaxaca-Blinder Type Decompositions
Author(s): Angela Wade*+ and Vassiliki Bountziouka and Sooky Lum
Companies: University College London Institute of Child Health and University College London Institute of Child Health and University College London Institute of Child Health
Keywords: oaxaca ; oaxaca-blinder ; decomposition ; interaction
Abstract:

Oaxaca-Blinder decompositions have been used for many years to explain wage differentials between subgroups of the population e.g. males and females. The decomposition separates the difference in outcome between subgroups into two parts. Firstly, that attributable to differences in the determinants of outcome, such as age or education levels. Secondly, the difference due to discrimination ie. the extent to which the relationship between determinants and outcome differs between subgroups. Recently these decomposition models have been applied within healthcare to try to explain inequalities between subgroups. The decomposition models rely on regression modelling within each subgroup followed by weighted comparison of the model components. This is in contrast to the standard approach of jointly modelling across subgroups and incorporating interaction terms. In this paper, we consider the approaches via application to a novel area and discuss what decomposition adds to interpretation. Data used for illustration consists of lung functions of different ethnic groups in South London and the modelling of distributional features.


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