Model summary: Since the R chart is in control, the Xbar chart is valid. The Xbar-Rcharts appear in the newly-generated window.Click “OK” in the window “Xbar-RChart – Options.”.Select the item “Perform all tests for special causes” in the dropdown menu.Click “Xbar-ROptions” button and a new window “Xbar-R Chart – Options” appears.Select the “Subgroup ID” as the “Subgroup size (enter a number or ID column).Select the “Measurement” into the box below “All observations for a chart are in one column.”.Click in the blank box right below “All observations for a chart are in one column” and the variables appear in the list box on the left.
A new window named “Xbar-RChart” appears.Click Stat → Control Charts → Variable Charts for Subgroups → Xbar-R.D3 and D4 are constants depending on the subgroup sizeĭata File: “Xbar-R” tab in “Sample Data.xlsx”.m is the subgroup size and k is the number of subgroups.Xbar Chart EquationsĪ2 is a constant depending on the subgroup size. The underlying distribution of the Xbar-R chart is normal distribution. The Xbar is valid only if the R chart is in control. The Xbar chart monitors the process mean and the R chart monitors the variation within subgroups. The R chart plots the difference between the highest and lowest values within a subgroup as a data point.The Xbar chart plots the average of a subgroup as a data point.The Xbar R chart is a control chart for continuous data with a constant subgroup size between two and ten.
0 kommentar(er)
