jackylpt
9th July 2005, 11:40 PM
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
Jennifer Kirley
11th July 2005, 02:30 PM
Does anyone have advice for Jacky?
Jim Wynne
11th July 2005, 02:49 PM
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 this document (http://www.minitab.com/support/docs/CapaNormalFormulasCapaStats.pdf) from Minitab helps.
Marc
11th July 2005, 04:53 PM
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 (http://Elsmar.com/Forums/showthread.php?t=12683)
jackylpt
12th July 2005, 02:10 AM
Hi JSQ05 and Marc,
Thank you so much. I do appreciate that. :topic:
Michael
ben
12th July 2005, 03:19 PM
"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.
