This procedure provides a simple calculation for sigma level and other common performance measurements.
1. Choose ProcessMA > Quality Tools > Sigma Calculator.
2. In Type of data, choose the type of data you have.
· If your data is Discrete:
- In Number of opportunities, enter a value for number of opportunities.
- In Number of defects, enter a value for number of defects (within number of opportunities).
· If your data is Continuous:
- In Variable, select a column containing the raw data.
- In Lower specification limit, enter a value for the lower specification limit.
- In Upper specification limit, enter a value for the upper specification limit.
3. Click Calculate.
Number of opportunities: Integer.
Number of defects: Integer.
Variable: Numeric.
Lower specification limit: Numeric.
Upper specification limit: Numeric.
[Case 1]
You work in manufacturing plant and you need to make sure that the diameter of the parts made is 300mm ± 3mm to meet technical specifications. You want to calculate the sigma performance against the specifications.
1. Open worksheet ProcessMA > Tools > Data Files > Control.xls.
2. Choose ProcessMA > Quality Tools > Sigma Calculator.
3. In Type of data, choose Continuous.
4. In Variable, select L – Diameter.
5. In Lower specification limit, enter 297.
6. In Upper specification limit, enter 303.
7. Click Calculate.
[Case 2]
Your factory produces 4000 capacitors a day and of which 23 are defective. Calculate the sigma performance.
1. Choose ProcessMA > Quality Tools > Sigma Calculator.
2. In Type of data, choose Discrete.
3. In Number of opportunities, enter 4000.
4. In Number of defects, enter 23.
5. Click Calculate.
