Time series plot a central line is plotted and limits are placed symmetrically on either side of the line to show routine variation. Variation outside of these limits allows you to see signal for change (whether managed or unmanaged)1.
- The process behavior chart defines the Voice of the Process and allows the user to determine whether it is safe to extrapolate into the future
- the process behavior chart takes variation into account
Interpretation
- Look at the sequence of points adjacent to values that fall outside the limits as a run
1. Wheeler, D. J. Understanding Variation: The Key to Managing Chaos. (Spc Pr, Knoxville, Tenn, 2000).