Log-normal process capability
Hi, I have a process that is log-normally distributed and has an upper spec limit, and I'd like to calculate a Cpk. I tried two approaches that gave me different answers: Save spec limit as column property for process. Plot distribution of process, then Continuous Fit --> LogNormal to get a Cpk (checking goodness-of-fit of course)Add new column. Set column formula as log(process), save column uppe...
gv
Steven_Moore
jjhartwi