Journal article
A Bayesian Multiple Comparison Procedure for Order-Restricted Mixed Models
International statistical review, Vol.76(2), pp.268-284
Received October 2007, accepted April 2008
08/2008
DOI: 10.1111/j.1751-5823.2008.00051.x
Abstract
A Bayesian hierarchical mixed model is developed for multiple comparisons under a simple order restriction. The model facilitates inferences on the successive differences of the population means, for which we choose independent prior distributions that are mixtures of an exponential distribution and a discrete distribution with its entire mass at zero. We employ Markov Chain Monte Carlo (MCMC) techniques to obtain parameter estimates and estimates of the posterior probabilities that any two of the means are equal. The latter estimates allow one both to determine if any two means are significantly different and to test the homogeneity of all of the means. We investigate the performance of the model-based inferences with simulated data sets, focusing on parameter estimation and successive-mean comparisons using posterior probabilities. We then illustrate the utility of the model in an application based on data from a study designed to reduce lead blood concentrations in children with elevated levels. Our results show that the proposed hierarchical model can effectively unify parameter estimation, tests of hypotheses and multiple comparisons in one setting.
Details
- Title: Subtitle
- A Bayesian Multiple Comparison Procedure for Order-Restricted Mixed Models
- Creators
- Junfeng Shang - Department of Mathematics and Statistics, 450 Math Science Building, Bowling Green State University, Bowling Green, OH 43403, USA E-mail: jshang@bgnet.bgsu.eduJoseph E Cavanaugh - Department of Biostatistics, University of Iowa, USA E-mail: joe-cavanaugh@uiowa.eduFarroll T Wright - Department of Statistics, University of Missouri-Columbia, USA E-mail: WrightF@missouri.edu
- Resource Type
- Journal article
- Publication Details
- International statistical review, Vol.76(2), pp.268-284
- Edition
- Received October 2007, accepted April 2008
- DOI
- 10.1111/j.1751-5823.2008.00051.x
- ISSN
- 0306-7734
- eISSN
- 1751-5823
- Publisher
- Blackwell Publishing Ltd
- Number of pages
- 17
- Language
- English
- Date published
- 08/2008
- Academic Unit
- Statistics and Actuarial Science; Biostatistics; Injury Prevention Research Center
- Record Identifier
- 9984214698602771
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