Question on how to use R & R Spreadsheet downloaded from this site

[DMcLaughlin]

R & R Spreadsheet

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?

 

[Marc]

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?

 

[DMcLaughlin]

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.

 

[Marc]

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.