G
Hello,
I am fairly new to gage r&r studies, and I just finished running one on a ph meter, and got horrible results! (94.45 % Contribution and 97.18 % Study Variation)
10 samples of a Buffer solution were used (all were taken from the same source so they were assumed to be equal), three operators performed the measurements, two trials per operator. I also made sure the ph meter was calibrated and that all the proper procedures were followed when measuring.
I really wasnt expecting to get such bad results and I am not sure whether I did something wrong in the design of the test or if the measurement system is really that bad. I have attached a word document with the data, the minitab output for the crossed gage r&r and graphs. (wouldn't let me upload the minitab file...)
I would appreciate any comments/feedback/insights on what went wrong or any help on how to interpret what are the fallbacks of my measurement system. I noticed that basically all the variability is in repeatability, which doesnt seem that logical.
Appreciate your help,
Thank you!
Gabriela
I am fairly new to gage r&r studies, and I just finished running one on a ph meter, and got horrible results! (94.45 % Contribution and 97.18 % Study Variation)
10 samples of a Buffer solution were used (all were taken from the same source so they were assumed to be equal), three operators performed the measurements, two trials per operator. I also made sure the ph meter was calibrated and that all the proper procedures were followed when measuring.
I really wasnt expecting to get such bad results and I am not sure whether I did something wrong in the design of the test or if the measurement system is really that bad. I have attached a word document with the data, the minitab output for the crossed gage r&r and graphs. (wouldn't let me upload the minitab file...)
I would appreciate any comments/feedback/insights on what went wrong or any help on how to interpret what are the fallbacks of my measurement system. I noticed that basically all the variability is in repeatability, which doesnt seem that logical.
Appreciate your help,
Thank you!
Gabriela
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