The Capability Sixpack (Nonnormal) report provides a complete analysis of process stability using six charts including control charts, subgroup charts, and process capability charts (long-term only), and a probability plot for the selected distribution (for verifying a reasonable fit to the data). The analysis also includes only the traditional capability measures of Pp, Ppk; it does not provide any of the standard Six Sigma performance measures (long-term Z, short-term Z, DPMO).
The Capability Sixpack (Nonnormal) report gives you the option of choosing from 13 different distributions or using a Johnson Transformation for cases where none of the distributions provide an adequate fit to the data.
|When to Use||Purpose|
|Start of project||Perform a baseline capability analysis to determine process performance at the start of the project. The baseline analysis helps you set improvement goals for the project.|
|Mid-project||Perform a confirmation capability analysis after improvements have been implemented to confirm that the process performs as predicted.|
|End of project||Perform a capability analysis after implementing controls to obtain a final assessment of process capability, and also to determine whether the improvement goals of the project were attained.|
Continuous Y (output), at least one specification