What Makes the XmR Chart Work?Donald J. Wheeler
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The problem with the theoretical limits lies in the assumption that we know the exact relationship between the central line and the three-sigma distance. The solution is to obtain a separate estimate of dispersion, which is what theXmRchart does: While the average will characterize the location ...
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TIP: You can learn how to build an XmR chart for your measure here.What to do with a KPI’s performance gap…A performance gap is not just the difference between two numbers. It also includes a time lag between the current level of performance and the future targeted level of performance...
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Sarah stressed that approach two, using a ruler, is offered to better understand what the mathematical formula does. The most important question centers on the interpretation of howtrustworthya capability statistic is, which introduces the dependency on the XmR chart when using indivi...
neither he nor we went so far as to calculate a P value if I remember correctly, but we did use f tests to determine significance of the value. As you point out, no single summary statistic is as valuable as looking at and understanding the chart, but it comes in handy when y...
for the use of either the average and range chart or theXmRchart. In fact, a process cannot be said to be characterized by any probability model until it displays a reasonable degree of predictability. To paraphrase Shewhart,the purpose of a process behavior chart is to determ...