title: Parametric and semiparametric model-based estimates of the finite population mean for two-stage cluster samples with item nonresponse.
abstract: This article concerns item nonresponse adjustment for two-stage cluster samples. Specifically, we focus on two types of nonignorable nonresponse: nonresponse depending on covariates and underlying cluster characteristics, and depending on covariates and the missing outcome. In these circumstances, standard weighting and imputation adjustments are liable to be biased. To obtain consistent estimates, we extend the standard random-effects model by modeling these two types of missing data mechanism. We also propose semiparametric approaches based on fitting a spline on the propensity score, to weaken assumptions about the relationship between the outcome and covariates. These new methods are compared with existing approaches by simulation. The National Health and Nutrition Examination Survey data are used to illustrate these approaches.
authors.affiliation: Department of Biostatistics and Applied Mathematics, M.D. Anderson Cancer Center, Houston, Texas 77030, USA.
authors.forename: Ying
authors.initials: Y
authors.lastname: Yuan
authors.forename: Roderick J A
authors.initials: RJ
authors.lastname: Little
mesh_terms: D000465:Algorithms; D016000:Cluster Analysis; D003198:Computer Simulation; D003625:Data Collection; D003627:Data Interpretation, Statistical; D003710:Demography; D008954:Models, Biological; D015233:Models, Statistical; D015203:Reproducibility of Results; D018401:Sample Size; D012680:Sensitivity and Specificity