in this paper, we describe our implementation of an interior point algorithm for large scale systems. first we identify system with small and medium methods convex optimization, then we use interior point method for identification. finally we offer an interior point method that uses nonlinear cost function and see that we achieve a good trade-off between error and cpu time. actually, in this pa...

This paper proposes some ratio-type estimators for population mean using known skewness coefficient of auxiliary variable. Theoretically, the expressions of mean square error(MSE) up to first order of approximation for all proposed ratio estimators are obtained. The efficiency between the proposed estimators and some known estimators is compared. The results are supported by an application with...