Ramalho, Esmerelda A.; Smith, Richard - Centre for Microdata Methods and Practice (CEMMAP) - 2003
dependent variable is unobserved or situations when both dependent variable and covariates are missing for some sampling units … treatment of these various sampling structures is presented using a formulation of the nonresponse problems as a modification of … choice-based sampling. Extensions appropriate for nonresponse are detailed of Imbens' (1992) effcient generalized method of …