title: Bayesian analysis of prevalence with covariates using simulation-based techniques: applications to HIV screening.
abstract: Ignoring the limited precision of medical diagnostic tests can incur serious bias in prevalence estimation. Conversely, treating the values of sensitivity and specificity as constants, as in most studies, inevitably underestimates the variability of prevalence estimates. Bayesian inference provides a natural framework with which to integrate the variability in the estimates of sensitivity and specificity with estimation of prevalence. However, the resulting model becomes quite complicated and presents a computational challenge. Recently, Mendoza-Blanco et al. proposed a missing-data approach with simulation-based techniques to deal with the computational difficulties. Although their approach is quite effective in reducing the computational complexity into manageable tasks, their developed methodology is not general enough for modelling the effects of covariates in prevalence estimation. In this paper, we extend their work in this direction by combining their missing-data approach with a latent variable technique for modelling discrete data. The present work also generalizes the methods of Albert and Chib for Bayesian analysis of binary response data with errors in the response. We illustrate the methodology with several real data examples extracted from the literature.
authors.affiliation: Department of Biostatistics and Epidemiology, University of Pennsylvania School of Medicine, 604 Blockley Hall, 423 Guardian Drive, Philadelphia, PA 19104-6021, USA.
authors.forename: X M
authors.initials: XM
authors.lastname: Tu
authors.forename: J
authors.initials: J
authors.lastname: Kowalski
authors.forename: G
authors.initials: G
authors.lastname: Jia
mesh_terms: D015492:AIDS Serodiagnosis / Q000706:statistics & numerical data; D000465:Algorithms; D001499:Bayes Theorem; D015153:Blotting, Western; D003198:Computer Simulation; D019937:Diagnostic Techniques and Procedures / Q000706:statistics & numerical data*; D004797:Enzyme-Linked Immunosorbent Assay; D004813:Epidemiology; D015483:HIV Antibodies / Q000097:blood; D006801:Humans; D016013:Likelihood Functions; D008297:Male; D008390:Markov Chains; D008403:Mass Screening; D015233:Models, Statistical; D009010:Monte Carlo Method; D009716:Numerical Analysis, Computer-Assisted; D015995:Prevalence
chemical_list: D015483:HIV Antibodies