변량표본추출간격을 이용한 (equation omitted)x-R 관리도의 연구

A study on the (equation omitted)x-R control chart with variable sampling interval scheme

In this design the sampling interval that each sampling time changes according to the valuse of the previous to sample statistics, sample mean and ranges. The VSI scheme uses large sample if the sample statistics appear near in side the control limits and smaller sample otherwise. The efficiency of the VSI scheme is compare to the FSI. It is shown that VSI control chart improves the confidence of the procedure and performens better than FSI control chart.