Cusum Chart in Excel

Jay Arthur
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Cusum charts (Cumulative Sum Charts) evaluate stability of processes using variable data--time, cost, length, weight.

The Cusum chart can detect process shifts more rapidly than the XmR or XbarR. If a trend develops, it's evidence that the process has shifted.

A Cusum Chart consists of the following:

• A target which is either provided by you or calculated as the mean of your data.
• Upper Cusum Limit and Lower Control Limit lines.
• C+ and C- lines which represent the difference between your data and the target. Use these lines to determine if your process is shifting.

Here is a sample of a cusum chart created using the QI Macros SPC Software for Excel:

Cusum chart video

EWMA chart

Cusum charts are just one of the tools included in the QI Macros for Excel SPC Software for Excel.

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