Process capability analysis

As part of your Six Sigma analyses, you can use Minitab® to determine the special Process Capability (Cpk) measure, which can be calculated based on the data supplied by PPM. Process capability describes the stability and reproducibility of a process, i.e., the Cpk value specifies how reliably the specified objectives are achieved.

Procedure

  1. Create a process capability analysis for the PPM data exported to Minitab®.

    You can create such an analysis in Minitab® by selecting Stat/Quality Tools/Capability Analysis/Normal in the main menu.

    To provide the Cpk measure for data export from Minitab®, it must be stored in the Minitab® worksheet. To set the analysis parameters, click the Storage button and select the Cpk option in the dialog box that is displayed.

    MT_storage

    The Cpk measure is added to the data table from PPM.

  2. Create a macro for the current analysis as described in chapter Assign a Minitab® macro to the PPM analysis and save it as a Minitab® file in mtb format.
  3. Assign this macro to the corresponding current analysis in PPM.
  4. Save the current settings as a separate favorite.

You can then use the favorite to easily start the Minitab® evaluation again from PPM.

Example: Process capability analysis for billing

MT_cpk2006