Examples
Examples
Try the starting example
- Defect counts per equal-opportunity sample (defects)
- 2,4,6
- C-chart center (defects/sample)
- 4
- Lower limit (defects/sample)
- 0
- Upper limit (defects/sample)
- 10
Try another scenario
- Defect counts per equal-opportunity sample (defects)
- 8,10,12
- C-chart center (defects/sample)
- 10
- Lower limit (defects/sample)
- 0.513167
- Upper limit (defects/sample)
- 19.486833
Calculation method
Calculation method
C-chart center (defects/sample)
mean(counts).
Lower limit (defects/sample)
max(0,cbar-3*sqrt(cbar)).
Upper limit (defects/sample)
cbar+3*sqrt(cbar).
Symbols and units
- a
- Defect counts per equal-opportunity sample (defects)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Poisson three-sigma approximation, same opportunity/exposure every sample; one unit may have multiple defects. No normality or process certification claim. Supported limits: 1..1000 nonnegative integer counts; equal opportunity required.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
Background reading; this does not imply endorsement or independent review of SumFizz.