See SHWXR1 in the SAS/QC Sample LibraryIn this example, the XRCHART statement is used to create a summary data set that can be read later by the SHEWHART procedure
(as in the preceding example). The following statements read measurements from the data set Wafers
and create a summary data set named Waferhist
:
proc shewhart data=Wafers; xrchart Diameter*Batch / outhistory = Waferhist nochart; run;
The OUTHISTORY= option names the output data set, and the NOCHART option suppresses the display of charts. Figure 17.108 contains a partial listing of Waferhist
.
Figure 17.108: Partial Listing of the Summary Data Set Waferhist
Summary Data Set for Wafer Diameters |
Batch | DiameterX | DiameterR | DiameterN |
---|---|---|---|
1 | 34.992 | 0.02 | 5 |
2 | 34.994 | 0.03 | 5 |
3 | 34.998 | 0.01 | 5 |
4 | 34.998 | 0.02 | 5 |
5 | 34.992 | 0.02 | 5 |
There are four variables in the data set Waferhist
:
Batch
contains the subgroup index.
DiameterX
contains the subgroup means.
DiameterR
contains the subgroup ranges.
DiameterN
contains the subgroup sample sizes.
Note that the summary statistic variables are named by adding the suffix characters X, R, and N to the process Diameter
specified in the XRCHART statement. In other words, the variable naming convention for OUTHISTORY= data sets is the same
as that for HISTORY= data sets.
For more information, see OUTHISTORY= Data Set.