Cusum Chart in Excel

Cusum Charts (Cumulative Sum Charts) are Used to Detect Smaller Shifts in a Process

The Cusum chart can detect process shifts more rapidly than the XmR or XbarR Shewhart Control Charts. 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 cumulative sum of deviations of successive sample means from a target.  Use these lines to determine if your process is shifting.

Sample of a Cusum Chart created using the QI Macros SPC Software for Excel:

cusum chart in Excel created using the QI Macros software

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