Select the analysis options for Normal Capability Sixpack

Stat > Quality Tools > Capability Sixpack > Normal > Options

In This Topic

Number of subgroups display: Last
Target (adds Cpm to table)
Use tolerance of K × σ for capability statistics K =
Display
Title

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.

Target (adds Cpm to table)

If your process has a target, enter the value. If you enter a target value, Minitab calculates Cpm, a capability index that also considers how much the data deviate from the target.

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.

Note

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.

Display

Select the measures of capability that you want Minitab to display:

Capability stats (Cp, Pp): Calculate and display capability indices, such as Cp and 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.

Note

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.

Title

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