Quality control of industrial products using an exponentially weighted moving average chart of subgroups

Abstract

One of the statistical methods for quality
control, represented in the control chart
of the exponentially weighted moving
average of the subgroups, has been
applied in Sutter fit, Tiaret, In order to
measure the quality of the industrial
products of this institution, This type of
map was used with different values of
the weighting constant as suggested by
Farnum and Montgomery; this is done
using the standard deviation estimated
either by the mean of the range or by the
mean of the standard deviation. Six maps
were extracted, all of which were
statistically unstable.