Powered by: Blackwell Publishing

HRET - Health Research & Educational Trust

HSR - Health Services Research

Impacting Health Practice and Policy Through State-of-the-Art Research and Thinking

Our Next Issue

December 2018
Coming Soon! Read

< ABSTRACT LIST

VOLUME 48 | NUMBER 5 | OCTOBER 2013


Beta-Binomial Regression and Bimodal Utilization

Keywords: Beta-binomial;bimodal;veterans;primary care;Medicare;utilization

Objective: To illustrate how the analysis of bimodal U-shaped distributed utilization can be modeled with beta-binomial regression, which is rarely used in health services research.

Data Sources/Study Setting: Veterans Affairs (VA) administrative data and Medicare claims in 2001–2004 for 11,123 Medicare-eligible VA primary care users in 2000.

Study Design: We compared means and distributions of VA reliance (the proportion of all VA/Medicare primary care visits occurring in VA) predicted from beta-binomial, binomial, and ordinary least-squares (OLS) models.

Principal Findings: Beta-binomial model fits the bimodal distribution of VA reliance better than binomial and OLS models due to the nondependence on normality and the greater flexibility in shape parameters.

Conclusions: Increased awareness of beta-binomial regression may help analysts apply appropriate methods to outcomes with bimodal or U-shaped distributions.

back to top | back to article index | access/purchase full article

Copyright© 2018, Health Research & Educational Trust. All rights reserved. Content Disclaimer
Health Research & Educational Trust, 155 North Wacker, 4th Floor Chicago, IL 60606 (312) 422.2600