An expanded case against synthetic‐type control charts

During the last two decades, many new methods have appeared in statistical process monitoring with synthetic-type control charts being a prominent constituent. These became popular due to their simplicity and proclaimed excellent change point detection performance. Synthetic are nothing more than application of well-known long established runs rules. We show that better performance can be obtained by using exponentially weighted moving average (EWMA) charts. Expanding on some previous questioning articles, we critically reflect upon recently developed variants order emphasize there is no reason apply this special class This paper renews extends criticism respond newly synthetic charts, called “revised” “modified” incorporation further restrictions observations leading an out-of-control signal. Furthermore, demonstrate “improved charts” (synthetic augmented outer Shewhart limit) perform weaker EWMA–Shewhart chart combinations.