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Publication date: 11/10/2021

Historical Information

Use this outline 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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