Comparison of Semi-Economic and -R Control Charts for Non-Ageing and Ageing Process

This paper compares semi-economic -control charts and -R control charts assuming two different discrete distributions for the length of the in-control period of a production process with regeneration points given by the alarms signals. Sample sizes and control limits for a set of parameters are calculated for both models. For comparison purposes, values of average cost and of probabilities of Type I and II errors are also computed and displayed.