This article analyses the performance of a one-sided cumulative sum (CUSUM) chart that is initialized using a random starting point following the natural or intrinsic probability distribution of the CUSUM statistic. By definition, this probability distribution remains stable as the chart is...

This article presents a universal quantile-quantile (QQ) plot that may be used to assess the fit of a family of absolutely continuous distribution functions in a possibly non-homogeneous population. This plot is more general than probability plotting papers because it may be used for...

Many industrial processes must be adjusted from time to time to maintain their mean continuously close to the target value. Compensations for deviations of the process mean from the target may be accomplished by feedback and/or by feedforward adjustment. Feedback adjustments are made in reaction...