A quality control chart is a graphic that depicts whether sampled products or processes are meeting their intended specifications.

Control limits, how do they work? Is it a probability limit? Is it an economic limit? Read on to find out! Overview: What Are Control Limits? A control chart consists of several parts. It has two ...

This paper proposes a heuristic method based on adjusted weighted standard deviation for constructing R chart for skewed process distributions. The asymmetric control limits of the chart are ...

We evaluate control chart combinations using the expected detection time for the various types of process changes and a quadratic loss function. When a signal is generated, it is important to know ...