Profile control chart based on maximum entropy

Abstract

Monitoring a process over time is so important in manufacturing processes to reduce the wastage of money and time. The purpose of this article is to monitor profile coefficients instead of a process mean. In this paper, two methods are proposed for monitoring the intercept and slope of the simple linear profile, simultaneously. The first one is linear regression, and another one is the maximum entropy principle. A simulation study is applied to compare the two methods in terms of the second type of error and average run length. Finally, two real examples are presented to demonstrate the ability of the proposed chart