In general, Gage R&R means from the replication & Repetition to find the error of the gage(Instrument Error) or the Reliability of Inspectors[*At least of 2 sets data of Inspection], through the comparsion of all Standard deviations.
Franky speaking, nowaday it is no longer use the R&R Table to do the comparsion as minitap, Excel,..etc, have replace the manual calcuation.
Lastly, post yr e-mail or MSN Messenger address here if you want to know the theory or manual calucation regarding R&R. ***Regret of my statement all in English, as my PC can't write Chinese, so be prepared my reply will be also in English.
Cheers!
Nestor (Black Belt)