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  Measurement, Test and Calibration
  R & R Spreadsheet

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Author Topic:   R & R Spreadsheet
DMcLaughlin
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posted 16 October 2000 02:27 PM           Edit/Delete Message   Reply w/Quote
I have downloaded the R&R spreadsheet on this site. I am familiar with some analysis of variance software but I'd like some guidance with this spreadsheet. For one particular lab test, I have four machines that should output similar results. I have 8 lab techs. I planned on each tech running 10 standardized samples through two machines with each machine being a "trial". Is this the proper way to address this? What variabilities will the outputs represent if I do it this way?

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Marc Smith
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posted 18 October 2000 06:17 PM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
I guess we should start out by asking which R&R spreadsheet? What's the file name?

If all the machines are the same brand, etc., you *may* get away with doing an R&R on 2 of the 4. But - are you doing an R&R on the machine or on the instrument measuring the output?

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DMcLaughlin
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posted 19 October 2000 03:22 PM           Edit/Delete Message   Reply w/Quote
The spreadsheet I downloaded is RandR.XLS. It appears to be very similar to gagr+r.xls. In my terminology, machine = test equipment. The manufactured "part" is beads of plastic resin. I used a standardized material tested in two of the machines. The material is very uniform and can be considered to have minimal variation.I will likely increase the study to all four machines.

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Marc Smith
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posted 19 October 2000 07:47 PM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
I have seen this type of 'similarity' argument successfully used - but I would think with only 4 devices I would do an R&R on each.

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