Amputation versus Imputation of Missing Values through Ratio Method in Sample Surveys

In this article, we consider the estimation of population mean when
some observations on the study characteristic are missing in the
bivariate sample data. In all, five estimators are presented and
their efficiency properties are discussed. One estimator arises
from the the amputation of incomplete observations while the
remaining four estimators are formulated using inputed values
obtained by the ratio method of estimation.