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Minitab 17 went back to Rbar/d2 and Sbar/c4 for XbarR/S control limits, but retained pooled stdev for Cp/Cpk calculations when using multiple samples.Learn More...Create a XbarS Chart in Excel using QI Macros XbarS Chart Video XbarS Capability Suite Template in Excel...
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Formulas for the XmR Trend Chart in QI Macros. Range Chart Trend Chart The center line (CL) is calculated using linear regression to give you the slope of the trend and a y-intercept value: "b", calculated as follows: time(i) = ti = 1,2,3,4...k for each X value m...
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A customer sent me their home grown template for calculating Cp and Cpk and wondered why the QI Macros got such radically different values. It was easy to see from their data that they were using standard deviation, not Sigma estimator (Rbar/d2) to calculate Cp and Cpk. Use Stdev to cal...
QI Macros will do the math and draw the graph for you. Go Deeper: The p Chart is used to evaluate process stability when counting the number or fraction defective. The p Chart is used when the sample size varies. Examples include the number of defective products, meals in a restaurant, ...