![]() I real thought of myself as a SPC guru until now. Please help! I now don’t know which Cpk to report. Please see formulas used on Excel and data below. I then tried all the other different methods (RBar, SBar, Pooled, and Biased/Unbiased) that Minitab provides of estimating sigma and neither one resulted in the same Cpk as Excel. ![]() condition and low Cpk in graphical format using Minitabs Process Capability Six Pack. Although, the Cpk reading (-2.17) I got using Excel showed up on my Six Pack as a Ppk (used Pooled/use an unbiased constant section unselected). I was about to send the supplier the data indicating the out-of-spec. ![]() ![]() I just ran a capability study using Excel (I always used Minitab).
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