K
I just ran a GRR on an instrument (my first!) and the results were pretty good, but I have a question on interpretation of the %PV & %TV results.
First the experiment: 4 Appraisers, 5 Samples across a Tolerance Range 10 units wide, 2 trials per sample. The instrument & method is a wet-chemical acid titration.
The %GRR(versus Tolerance range, Barrentine's MCI2) came in at 17%, with about 90% of the variation coming from the instrument...not bad.
The %PV came in at 111%. The %TV came in at 112%. None of the samples used in the GRR experiment were either above or below the Tolerance Limits (LSL or USL).
How do I interpret the %PV & %TV results?
First the experiment: 4 Appraisers, 5 Samples across a Tolerance Range 10 units wide, 2 trials per sample. The instrument & method is a wet-chemical acid titration.
The %GRR(versus Tolerance range, Barrentine's MCI2) came in at 17%, with about 90% of the variation coming from the instrument...not bad.
The %PV came in at 111%. The %TV came in at 112%. None of the samples used in the GRR experiment were either above or below the Tolerance Limits (LSL or USL).
How do I interpret the %PV & %TV results?