Compromised imputation in survey sampling

By Sarjinder Singh, Stephen Horn. 2000

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Improved Estimators of the Population Mean for Missing Data (2010, methodology): “Following Singh and Horn ( 2000 ), we implicitly assume a MCAR mechanism generating missing data.”
Imputation by power transformation (2003, methodology): “units in the methods proposed by Singh and Horn (2000) and Singh,”
A new method of imputation in survey sampling (2009, methodology): “The behaviour of the resultant estimator is similar to the new imputation procedures proposed by Singh and Deo [9], Singh and Horn [10] and Singh et al.”
Estimators for the Population Mean in the Case of Missing Data (2008, methodology): “Third proposed estimator, given in (28), is more efficient than the estimators in Singh and Horn (2000) and Singh and Deo (2003), given in (6) and (7), respectively, when the following condition is satisfied: R2 0 (43) However, this condition is never satisfied so the estimators in Singh and Horn…”