Bayesian models for data missing not at random in health examination surveys
Kopra, J., Karvanen, J., & Härkänen, T. (2018). Bayesian models for data missing not at random in health examination surveys. Statistical Modelling, 18 (2), 113-128. doi:10.1177/1471082x17722605
Published inStatistical Modelling
© 2017 SAGE Publications
In epidemiological surveys, data missing not at random (MNAR) due to survey nonresponse may potentially lead to a bias in the risk factor estimates. We propose an approach based on Bayesian data augmentation and survival modelling to reduce the nonresponse bias. The approach requires additional information based on follow-up data. We present a case study of smoking prevalence using FINRISK data collected between 1972 and 2007 with a follow-up to the end of 2012 and compare it to other commonly applied missing at random (MAR) imputation approaches. A simulation experiment is carried out to study the validity of the approaches. Our approach appears to reduce the nonresponse bias substantially, whereas MAR imputation was not successful in bias reduction.