The problem of non-response in double (or two phase) sampling is dealt with combined ratio, product and regression estimators. Expressions of bias and MSE for these estimators are obtained. Comparisons of a proposed strategy with a usual unbiased estimator and other estimators are carried out and results obtained are illustrated numerically using an empirical sample.
Kumar, Sunil and Viswanathaiah, M
"Population Mean Estimation with Sub Sampling the Non-Respondents Using Two Phase Sampling,"
Journal of Modern Applied Statistical Methods:
1, Article 12.
Available at: http://digitalcommons.wayne.edu/jmasm/vol13/iss1/12