Two methods to obtain preferred efficiency for negative data (IS)
Subject Areas : International Journal of Mathematical Modelling & ComputationsHossein Abbasiyan 1 , mohamadjafar doostideilami 2
1 - Department of Mathematics and Statistics Aliabad Katoul Branch, Islamic Azad University
2 - Department of mathematics, Aliabad katoul branch, Islamic azad university, Aliabad katoul, iran
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