Vol. 6, No. 4
from Professor Cleary
Ben Lofen should check an SPC book, where he will discover that two points do not make a run, in anyone’s estimation. Depending on the industry, a run is typically defined as 6 to 8 data points moving in the same direction (up or down), or 6 to 8 data points above or below the mean.
Copyright 2004 PQ Systems.
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