Causal Inference; Finite Population Sampling Techniques; Imputation; Political Polling; Longitudinal Data Analysis (esp. in epidemiological and public health settings)
Matrix Completion Recommender Systems, Regularization methods (e.g. ℓ1 ℓ2 and nuclear-norm penalty), Spatial Statistics Genomic Prediction and Genomic Selection.
Statistical inference for massive data; High-Dimensional data analysis; Genomic data analysis; Bootstrap and related area; Quantile Regression; Time series; Functional data analysis.