R-CHARTRevised Craig Handicap Assessment and Reporting Technique
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This is probably the earliest article showing the application of x-bar and R-charts for the kiln-drying process.
There are several variations of the R-chart. First, it is possible to construct an R-chart using individual data, although reservations have been expressed concerning the accuracy of this chart (Doty, 1996; Ostle et al., 1996).
If the outcome is continuous, an X-mR-chart or m [bar]X-mR-chart should be used if the sample sizes equal 1 (the latter with a slowly changing, more variable process), an [bar]X-R-chart and R-chart should be used if the sample sizes are equal and range from 2 through 10, and an [bar]X-S-chart and S-chart should be used if the sample sizes are equal and greater than 10.
Thus far, we have developed spreadsheets for the X-mR-chart, [bar]X-R-chart, R-chart, p-chart, and c-chart.
SPSS allows the user to select among four categories of SPC charts: (1) [bar]X-R-charts, [bar]X-S-chart, R-charts, and S-charts; (2) X-mR-charts and mR-charts; (3) p-and np-charts; and (4) c- and u-charts.
Task Component 4 -- determining the total number of points falling outside the control limits on the X-bar and R-charts.