A run chart is a chart that plots values in time order:
The center line is the median value. A run is defined as one or more consecutive points on the same side of the median. The runs are analyzed, patterns that indicate a 'special cause' are:
- the presence of too few, or too many, runs for the number of points
- too many data points in a run
- an unusually long sequence of ascending or descending data points
- too many points forming a zigzag pattern
Run Charts are similar to Control Charts, however there are some important differences. Control Charts are better for monitoring processes on an ongoing basis. Run charts are often better for investigating short term process improvement opportunities.
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