Process Control using Control Diagram of Median Absolute Deviation (MAD)

Abstract

Control diagram is a tool used to find out something that out of line in industry process. There are two kinds of control diagrams they are control diagram of variable and control diagram of attribute. There are two kinds of control diagrams in variable control diagram; process minimum and process variability.there is a minimum control diagram in  Control diagram of process minimum, and process variability that is commonly used is control diagram of distance (D) and control diagram of standard deviation (SD). Control diagram of standard deviation (SD) is a technique of quality control process developed to control process variability based on the assumption of normal distribution, or the outlier. When the normality assumption is insatiable or there is an isolation, the certain method will be used. The method is called Median Absolute Deviation (MAD). There are some stages to determine MAD to obtain controlled process. To compare control diagram of MAD, it is necessary to do comparation on control diagram of MAD and control diagram of standard deviation. So that the control limit result on minimum control diagram based on MAD is wider than minimum control diagram of standard deviation.