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Kholif, A. M., D. A. E. S. Hassan, M. A. Khorshid, E. A. eLsherpieny, and O. A. Olafadehan, "Implementation of model for improvement (PDCA-cycle) in dairy laboratories", Journal of Food Safety, vol. 38, issue 1, pp. 1-6, 2018. pdca_l-2018-journal_of_food_safety.pdf
Abd-Elfattah, A. M., E. A. El-Sherpieny, S. M. Mohamed, and O. F. Abdou, "Improvement in estimating the population mean in simple random sampling using information on auxiliary attribute", Applied Mathematics and Computation, vol. 215, pp. 4198–4202, 2010. Abstractimprovmentsayed.pdf

This paper proposes some estimators for the population mean by adapting the estimator in Singh et al. (2008) [5] to the ratio estimators presented in Kadilar and Cingi 2006 [2]. We obtain mean square error (MSE) equation for all proposed estimators, and show that all proposed estimators are always more efficient than ratio estimator in Naik and Gupta (1996) [3], and Singh et al. (2008) [5]. The results have been illustrated numerically by taking some empirical population considered in the literature.