Run Charts

A run chart is typically a line graph of sequential data points plotted over time. It reveals trends of a quantity over time.

For instance,  a run chart of energy use in kilowatts versus time in minutes to trace the power patterns of a device.

If, on examination, the data scatters showing natural variation without identifiable patterns, the process is statistically stable.

Conversely, steady trends, ascending or descending, hint at process instability and possible power overuse or underuse.

Abrupt changes or periodic patterns in the chart call for probing potential instrument issues, like a need for part adjustment.

Outliers or isolated anomalies in an otherwise stable run may not be critical but must be evaluated for causes such as unexpected power surges or high-demand periods.

Expert interpretation of run charts is crucial as it can improve quality by distinguishing random fluctuations from significant shifts.