Select the analysis options for Nonnormal Capability Sixpack

Stat > Quality Tools > Capability Sixpack > Nonnormal > Options

Number of subgroups display: Last

Specify the number of subgroups to display in the Run chart at the lower left of the graph. The default is 25.

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.

If you want to display benchmark Z's by default whenever you perform a capability analysis, 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.

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