Accounting for nonignorable unit nonresponse and attrition in panel studies with refreshment samples." Journal of Survey Statistics and Methodology 3, no. 3 (2015): 265-295. DOI: 10.1093/jssam/smv007, available at http://jssam.oxfordjournals.org/content/3/3/265.abstract."
Nonparametric Bayesian models with focused clustering for mixed ordinal and nominal data." ArXiV, no. 1508.03758 (2015), available at http://arxiv.org/abs/1508.03758."