Select the analysis options for Nonnormal Capability Analysis

Stat > Quality Tools > Capability Analysis > Nonnormal > Options


If your process has a target value, enter the number. Minitab displays the target value on the capability histogram and the process data table.

Use tolerance of K × σ for capability statistics K =

Enter the width of the tolerance in number of standard deviations (σ). By default, the tolerance is 6 standard deviations wide (3 standard deviations on each side of the process mean).

Minitab interprets the K value as the width of a two-sided tolerance. If you want to use a one-sided tolerance, enter a two-sided tolerance value that is twice that of the one-sided tolerance. For example, if you want to use a one-sided tolerance of 3σ, enter 6.


If you want the tolerance value that you enter to be the default setting for every capability analysis that you perform, choose File > Options > Control Charts and Quality Tools > Capability Analysis and enter the default tolerance.


Select the measures of capability that you want Minitab to display:
  • Capability stats (Pp): Calculate and display capability statistics such as Pp.
  • Benchmark Z’s (σ level): Calculate and display Z.bench values. The choice to use Z.Bench often depends on company or industry practices.
Select how you want to display the expected and observed out-of-specification values:
  • Parts per million: Display the values in parts per million (PPM).
  • Percents: Display the values as percentages.

If you want to change which statistics display by default, choose File > Options > Control Charts and Quality Tools > Capability Analysis and change the default display setting.


You can enter a new title for the process capability report.