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Publication date: 04/21/2023

Historical Information

In the Process Capability launch window, the options in this section enable you to assign historically accepted values of the standard deviation to variables in the Y, Process list.

1. Select a variable or variables in the Y, Process list.

2. Enter a value next to Set Historical Sigma.

3. Select Use Historical Sigma to assign that value to the selected variables.

The specified value appears in parentheses in the expression “&Sigma()” to the right of the variable names in the Y, Process list.

Note: If you set a historical sigma, then subgroup assignments for the selected process variable are no longer relevant and are removed.

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