Help with Mintab concepts: Expected "overall" performance vs. Observed performance

[jackylpt]

In mintab, I confued some concepts, want to get help

Expected "overall" performance: The expected "overall" performance values quantitatively represent the actual process performance. The expected values are calculated using the overall sample variance.

Observed performance: The observed performance section tells you the actual number of parts per million located beyond the specification limits.

what is difference between these two things? I think both of them are actual value which was found of out of specification? thanks

 

[Jen Kirley]

Does anyone have advice for Jacky?

 

[Jim Wynne]

In mintab, I confued some concepts, want to get help

Expected "overall" performance: The expected "overall" performance values quantitatively represent the actual process performance. The expected values are calculated using the overall sample variance.

Observed performance: The observed performance section tells you the actual number of parts per million located beyond the specification limits.

what is difference between these two things? I think both of them are actual value which was found of out of specification? thanks

See if (broken link removed) from Minitab helps.

 

[Marc]

Does anyone have advice for Jacky?

I started two threads in our new 'Definitions and Acronyms' forum. Hopefully we'll get some feedback there as well. See: Performance - Expected "overall" performance - From Minitab

 

[jackylpt]

Hi JSQ05 and Marc,

Thank you so much. I do appreciate that.

Michael

 

[ben]

"Observed perfromance is based on the actual results used for the analysis.

"Expected performance statistics are predictions of the proportions that will fail the specification limits in the long term. They are based on the normal statistical model (if that is the distribution you selected) rather than the actual data.

"Two different sets of are produced, one based on the short term performance (within) and one on the long term (overall)."

This per the book Six Sigma and Minitab by QSB Consulting.