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Abstract
A control chart technique that considers exponentially weighted moving averages (EWMA) of the ranks of the observations is proposed. This nonparametric technique is outlier-resistant and performs well if one is concerned about sudden shifts in the process mean. The procedure is illustrated on a data set taken from the literature.
Additional information
Notes on contributors
Peter Hackl
Dr. Hackl is a Professor in the Department of Statistics. This research was carried out while he was on leave at the University of Iowa.
Johannes Ledolter
Dr. Ledolter is a Professor in the Department of Statistics and Actuarial Science and the Department of Management Sciences.
