Minitab R&R
Geoff:
Let me add my 5 cents, because I guess I can help you a little.
Number of Distinct Categories: NCD is calculated as
(ProcessSTDEV / MeasSTDEV)*1,41
By analyzing your data, is easy to notice that for ANOVA ProcessSTDEV = 0,0169 and MeasSTDEV = 0,00999. On the other hand, for Xbar/R, ProcessSTDEV = 0,0208 and MeasSTDEV = 0,00765.
For ANOVA, the NCD = 2,38 and rounded to nearest integer = 2.
For Xbar/R the NCD = 3,83 so = 4.
The difference between the exact NCD values is not too big (and leads you to the same decision, according to AIAG manual).
The additional problem here is related to the way that Minitab has rounded each one of the values (in opposite directions).
Differences in STDEVs are consequence of different methods of estimating sigma, but the differences in your example are not too big...
Hope this helps!