“…In addition, Lv , et al, [7] also pointed out that when only frequency weight is applied to cluster sampling data, there is a possibility that significance levels of all variables may become smaller as the size of the sample becomes bigger [6]. Nevertheless, many studies do not gain accurate analysis results as they perform statistical analysis , wrongly assuming the data from stratified sampling as those from simple random sampling [5,8,15]. As an alternative to this problem, Lee [16] suggested using the Rao-scott chi-square test as a categorical analysis method for complex sampling data and, by using data from Third National Health and Nutrition Examination Study of the U.S., proved that Rao-scott chi-square test can present more stable statistical figures than the Wald test.…”