Presenter: @Florian_Vogt
Learn how to use JMP's interactive quality and statistical process control features to uncover routine (common causes) or abnormal (special causes) process variations over time.
You will learn how to use JMP to find out if a process is stable and predictable, and how to track the effect of adjusting abnormal variations
Additional information based on the questions from the webinar:
1.Does the process capability analysis also work if the process is not normally distributed and cannot be normalized via transformation?
Yes, in this video this is shown. here is also a blog post about it. In general, it is worth taking a look at the "Distribution" platform - here you can find the distribution that most closely underlies the data and continue to carry out a process capability analysis based on that distribution (red triangle menu).
2.Can I also display a specification limit change (e.g. due date) within my data record or can I only display the entire data record with exactly one limit?
It is also possible to specify this here. A guide is here described (thanks @maurogerber ).
Further questions and comments from the Q&A:
1.Is the usual / expected tool wear common or special cause variation?
- In some books, tool or machine wear is seen as a special cause variation
- In this sense, drift is not a variation, but would be interpreted as a variation in an overall view (Ppk). This should be detected with SPC and control limits / test on 5 increasing values in a row.
- If the results jump around the mean value position within the limits and there are no 5 consecutive values, then, strictly speaking, this process must still be described as unstable, but this has nothing to do with the process capability
2.Info: in automatically generated scripts it may be that tolerances are permanently stored and overwrite the limits in the column properties in the evaluation (thanks also here to @maurogerber )
Discussions and other additions can of course be posted here!
@Florian_Vogt Thank you for demonstrating and answering question 2 about the specification changes.
I would have the following request after I get the link have read:
Is it also possible to display specification limit changes for the Graph Builder?
Thanks very much.
Hi @JHX ,
clear. When storing the specification limits, there is the option of using them as reference lines in graphs. Either in the column properties of a parameter:
When checked, the specification limits are automatically displayed in the Graph Builder. If specification limits are recorded via "Manage Spec Limits", the same can be achieved there by ticking "Show limits":
Many greetings
