Cpm Calculation issue within XBar ChartI have been trying to recreate the JMP calculations in SQL and can duplicate all of the process controls with the exception of Cpm. I am using JMP 12 and the Cpm formula from the "Process Capability in JMP 12 - A New Look" article. The equation is also on the image of the Xbar chart. I have include a .jmp data file to recreate the chart to see if the calculated Cpm is what you expect. Any help would be appreciated. Here are the calculated values using SQL:
Cp | Cpk | Cpm | Cpl | Cpu | Sigma | Average |
6.945 | 4.855 | 6.944 | 9.036 | 4.855 | 0.04799 | 0.301 |

Re: Cpm Calculation issue within XBar ChartLSL=-1;
Target=.3;
USL=1;
Mean=0.300960716247559;
Sigma=0.0479930638148251;
cpm=min(Target-LSL, USL-Target)/(3*sqrt(Sigma*Sigma+(Mean-Target)^2));
Mean and Sigma can be found by running the distribution platform on the response variable.
Re: Cpm Calculation issue within XBar ChartThe formula given in the version 12 documentation was incorrect. This was corrected in the version 13 documentation.