Born from empirical observations in nonuniformly sampled multidimensional NMR data relating to gaps between sampled points, the Poisson-gap sampling method has enjoyed widespread use in biomolecular NMR. While the majority of nonuniform sampling schemes are fully randomly drawn from probability densities that vary over a Nyquist grid, the Poisson-gap scheme employs constrained random deviates t...

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 paper is to examine the relationship between cultural globalization and the social acceptance of the body in girls and women in kermanshah city. synthesized theoretical framework was formulated by following the theories of giddens and robertson. the method of this study was survey and the main research tool was questionnaire. the sampling method used in the survey was multi-stage share ran...

OBJECTIVE The present study examined the prevalence of underweight and overweight in a group of primary-school children in Zahedan, south-east Iran. DESIGN A cross-sectional study in a randomly selected population of schoolchildren. SETTING Primary-school children in Zahedan city. SUBJECTS A random sample of 1079 students (boys = 500 and girls = 579). Data on child's age, parental educati...

Aggression is universal behavior that can be seen in all cultures and the most common behavioral problems in adolescence and young adulthood which can cause discomfort and distress of adolescents and young people and those around them. This research aim to survey of some social and individual factors influencing the tendency to aggression among youth in Deylam city. The methodology of this stud...

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...