This paper includes a simulation study on the bias and MSE properties of a two-step probit model estimator for handling missing values in covariates by conditional imputation. In one smaller simulation it is compared with an asymptotically ecient estimator and in one larger it is compared with...

The calibration approach is suggested in the literature for estimation in sample surveys under non-response given access to suitable auxiliary information. However, missing values in auxiliary information come up as a thorny but realistic problem. This paper considers the consistency of the...

When sampling from a finite population the access to a good samplingcframe is of vital importance. However, the statistician often has to confront the problem of estimation in the face of non-negligible frame imperfections, e.g. overcoverage and undercoverage. In this paper we <p> discuss different...</p>