Although the defining calculation equations for the
producer's process performance indexes (Pp8 and Ppk8) given
in 7.4 and 7.5 bear a resemblance to the defining equations for
the process capability indexes (Cp and Cpk), a legitimate
calculation of Cp and Cpk can be made only khi process is
in a state of statistical control. The symbols Pp 8 and Ppk8 have
đại diện Been selected to the producer's process performance
from other indexes added to Distinguish process capability and
performance indexes.
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