Σύγχρονα διαγράμματα ελέγχου για την μέση τιμή εφοδιασμένα με κανόνες ροών και σχηματισμών
Στογιάννος, Σπυρίδων - Νικόλαος Ε.
Shewhart-type control charts for monitoring the mean of a manufacturing process give signal of an out of control process (shift of the mean) when a plotted point falls outside the area specified by the lower (LCL) and upper (UCL) control limit of τηε chart. It is well known that Shewhart type control charts are not sensitive in detecting small shifts of the process mean. The sensitization of the chart to detect small shifts of the process mean is usually achieved by the use of warning limits (internal of LCL and UCL) and the adoption of stopping rules related with the appearance of special patterns of plotted points in the chart. The appearance of a special pattern of points gives signal of an out of control process. Such rules were introduced and applied for the first time in 1956 by the Western Electric Company. The main purpose of the dissertation is the presentation of the modern bibliography for stopping rules that are related to runs and patterns statistics in Shewhart-type control charts, and the comparative study of different approaches.