Collection of appropriate qualitative and quantitative data is necessary for proper management and planning. Used the suitable inventory methods is necessary and accuracy of sampling methods dependent the inventory net and number of sample point. Nearest neighbor sampling method is a one of distance methods and calculated by three equations (Byth and Riple, 1980; Cotam and Curtis, 1956 and Cota...

We apply the techniques of response surface methodology (RSM) to approximate the objective function of a two-stage stochastic linear program with recourse. In particular, the objective function is estimated, in the region of optimality, by a quadratic function of the firststage decision variables. The resulting response surface can provide valuable modeling insight, such as directions of minimu...

Relevance feedback is an effective and widely accepted method in information retrieval to improve performance. Relevance feedback generally uses an adaptive learning method to estimate the user’s information need. In this research, we propose an alternative two-stage sampling method to obtain an unbiased estimate of the user’s information need. Our estimate shows not only improved retrieval per...

collection of appropriate qualitative and quantitative data is necessary for proper management and planning. used the suitable inventory methods is necessary and accuracy of sampling methods dependent the inventory net and number of sample point. nearest neighbor sampling method is a one of distance methods and calculated by three equations (byth and riple, 1980; cotam and curtis, 1956 and cota...

The precision of parameters estimation are determined by the sample size and the sampling design used in a study. Due to such practical constraints as the budget and manpower, most large-scale educational studies would not adopt the simple random sampling design. TIMSS 2007 used a two-stage stratified cluster sampling design. In the first stage, about 150 schools were selected according to some...

this study aimed to identify and rank the most important environmental factors for the popularity of recreational sports in iran. only those sensitive aspects of the environment to which recreational sports should react were considered in order to survive. this study was performed consecutively in two qualitative and quantitative phases by mixed heuristic method. for this purpose the experts of...