A0610
Title: Doubly robust estimation for non-probability samples with modified intertwined probabilistic factors decoupling
Authors: Zhan Liu - School of Mathematics and Statistics, Hubei University (China) [presenting]
Abstract: In recent years, non-probability samples, such as web survey samples, have become increasingly popular in many fields, but they may be subject to selection biases, which results in the difficulty of inference from them. Doubly robust (DR) estimation is one of the approaches to making inferences from non-probability samples. When many covariates are available, variable selection becomes important in DR estimation. A new DR estimator for the finite population mean is constructed, where the intertwined probabilistic factors decoupling (IPAD) and modified IPAD are used to select important variables in the propensity score model and the outcome superpopulation model, respectively. Unlike the traditional variable selection approaches, such as adaptive least absolute shrinkage and selection operator and smoothly clipped absolute deviations, IPAD and the modified IPAD not only can select important variables and estimate parameters but also can control the false discovery rate, which can produce more accurate population estimators. Asymptotic theories and variance estimation of the DR estimator with a modified IPAD are established. Results from simulation studies indicate that the proposed estimator performs well. The proposed method is applied to the analysis of the Pew Research Center data and the Behavioral Risk Factor Surveillance System data.
