Upper CUSUM signal trace
Track accumulated upward departures and identify the first decision-interval crossing.
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Use a positive allowance and threshold in measurement units. Supply 1–500 observations. The cumulative sum starts at zero.
The starting values are hypothetical. Results update as you edit. Use aggregate or synthetic inputs only.
Calculation results
- First crossing (occasion)
- 4
- Maximum cumulative sum
- 4
- Final cumulative sum
- 4
How to interpret the output
Signals at or above the threshold. Continues without restart for inspection. No average run length or false-alarm probability is estimated. Select the design using a representative historical process. Method checked 9 November 2026.
Method reference