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...

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 efficient estimator and in one larger it is compared...

The quadratic mode regression estimator has been suggested for truncated regression models where symmetry characterizes the distribution of disturbances. In this paper the estimator is shown to be consistent and asymptotically normal distributed under asymmetrically distributed disturbances.