![]() In this publication, we will compare the two charts to see when you use one or the other. This chart is similar to the X-R chart, except that the subgroup standard deviation is used instead of the subgroup range for the within subgroup variation. There were a number of control charts I was exposed to back then. We definitely tried to keep things simple. There is still something to be said for teaching control charts using this manual method. ![]() The control charts we did back then were done manually – doing the calculations using a calculator and manually plotting the points, averages, and control limits. This was some years ago – back in the early 1980s. When I was first introduced to control charts, the X-R chart was used the most. 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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