Control Chart Based On Six Sigma For Range With Robust Scale Estimator

Abstract

Good planning is a top priority for every organization, whether it is in the industrial or service sectors, since it will affect how well the company performs in the marketplace. Good planning makes it simpler to develop, maintain, and upgrade products in an economical manner. The amount of planning needed depends on whether the product is new or not. This study proposes a new six-sigma based control chart that outperforms the Shewhart (1931) chart when the underlying normalcy assumption is not met. The new control chart uses the interquartile range (IQR) under normal and exponential distributions for range.