Yes, it usually works – but is it the best choice always? Some say the X-mR chart is the only chart you need to know because it always works. If you have infrequent data (like monthly), you don't have many options beyond the X-mR chart. It has probably given way to the X-mR chart as the use of SPC spread beyond manufacturing into other areas and "frequent" data became less frequent. The X-R chart, at one time, was the most used control chart. To explore this concept, two control charts will be examined and compared in this publication: the individuals (X-mR) control chart and the X-R control chart. You just need to be sure it is a movie of the variation you are interested in examining. What variation do you want the control chart to analyze/monitor? Every control chart is a movie of the variation in your process over time. There really should be some thought given to how a control chart is designed – and that depends on what you want to obtain from the control chart. What do you do? Many of us simply put the data into a software package and select the control chart we want to use – and, presto, we have our control chart. You want to analyze it using a control chart. Select this link for information on the SPC for Excel software.) Select "Return to Categories" to go to the page with all publications sorted by category. (Note: all the previous publications in the variable control charts category are listed on the right-hand side.
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