Ratio-cum-product type exponential estimator

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Improved Estimation of Finite-Population Mean Using Sub-Sampling to Deal with Non Response in Two-Phase Sampling Scheme (2010, methodology): “The motivation of suggesting the estimators tR1d and tP1d was obtained from Bahl and Tuteja (1991). The variance of t 1 a d to the first degree of approximation is given by:”
A new procedure for variance estimation in simple random sampling using auxiliary information (2013, unknown): “…(1989), Tracy et al. (1999), Upadhyaya and Singh (1999a), Singh and Tailor (2003), Kadilar and Cingi (2003, 2004), Gupta and Shabbir (2007, 2008a), Singh et al. (2008, 2009, 2010a), Koyuncu and Kadilar (2009), Singh and Vishwakarma (2010), Upadhyaya et al. (2011), Shabbir and Gupta (2011),…”
An Efficient Class of Estimators for the Population Mean Using Auxiliary Information (2013, background): “(2007) estimator tKr7, Koyuncu and Kadilar (2009a) estimator r7, Bahl and Tuteja (1991) estimator ter1 and estimator er1 have the smallest MSE value among their own class of estimators. • The minimum MSEs of Khoshnevisan et al. (2007) class of estimators tK , class of estimators te and Singh et al.”
Modified Exponential Ratio and Product Estimators for Finite Population Mean in Double Sampling (2016, background): “The objective of this paper is to propose double sampling versions of Bahl and Tuteja (1991) estimators and study their properties.”