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Select the analysis options for Between/Within Capability Sixpack

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Stat > Quality Tools > Capability Sixpack > Between/Within > Options

In This Topic

Target

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 x σ for capability statistics

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.

Capability index naming convention

In Capability index naming convention, select the convention that Minitab uses to name capability indices.
  • Six Sigma: Use Six Sigma names for capability indices.
  • AIAG/VDA: Use AIAG/VDA names for capability indices. The names depend on the selected process stage and capability calculation method.
When you select AIAG/VDA, you can also specify the stage of the capability assessment and the capability calculation method.
Note

For nonnormal methods, including those used in Automated Capability Analysis, you can select the capability calculation method with either naming convention. Capability calculation methods do not apply to nonparametric analyses.

In Process stage, select a stage appropriate for the purpose of your study. The output uses names for the statistics that relate to the process stage.
  • Process performance: Assess how well the process meets specifications allowing common-cause sources of variation to affect the output. Use a performance study when you do not have to demonstrate that the process is stable.
  • Process capability: Assess how well the process meets specifications allowing common-cause sources of variation to affect the output. Use a capability study when you have a requirement to demonstrate that the process is stable before you assess the process.
  • Machine performance: Assess how well a machine meets specifications while controlling for variation that does not arise from within the machine. Usually, you use this type of study to show that a machine is suitable to use in production.
In Capability calculation method, select one of the following.
  • Z-score method: Use the Z-score method, also called the Minitab method.
  • ISO method (geometric): Use the ISO method, also called the geometric method.
This table shows the capability indices for the two naming conventions. With AIAG/VDA names, the names also depend on the process stage, and calculation method.
Six Sigma AIAG/VDA
Cp Cw, or Cbw for between/within
Cpk Cwk, or Cbwk for between/within
Pp, Ppk Pp.Z, Ppk.Z or Pp.G, Ppk.G
Pp, Ppk Cp.Z, Cpk.Z or Cp.G, Cpk.G
Pp, Ppk Pm.Z, Pmk.Z or Pm.G, Pmk.G
Note

.Z identifies the Z-score method, and .G identifies the ISO method (geometric).

Tip

If you want the naming conventions and the calculation methods 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 your selections.

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.

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