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IRCHART Statement |
See SHWIR1 in the SAS/QC Sample Library |
By default, the IRCHART statement uses two consecutive measurements to calculate moving ranges. However, you can specify a different number of measurements to use, as illustrated by the following statements:
title 'Specifying the Computation of the Moving Range'; symbol v=dot c=yellow; proc shewhart data=jets; irchart diam*engine / limitn = 3 cframe = vigb cinfill = vlib cconnect = yellow coutfill = red; run;
The LIMITN= option specifies the number of consecutive measurements used to compute the moving ranges. The resulting charts are shown in Figure 34.8.
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Note that the LIMITN= value is displayed in the legend above the control limit labels. The charts indicate that the process is in control, since all the points lie within the control limits.
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