Saving Summary Statistics

XRCHART Statement

Saving Summary Statistics

See SHWXR1 in the SAS/QC Sample Library

In 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 WAFRHIST:

   title 'Summary Data Set for Wafer Diameters';
   proc shewhart data=wafers;
      xrchart diamtr*batch / outhistory = wafrhist
                             nochart;
   run;

The OUTHISTORY= option names the output data set, and the NOCHART option suppresses the display of the charts. Options such as OUTHISTORY= and NOCHART are specified after the slash (/) in the XRCHART statement. A complete list of options is presented in the "Syntax" section.

Figure 43.5 contains a listing of WAFRHIST.

Summary Data Set for Wafer Diameters

batch	diamtrX	diamtrR	diamtrN
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
6	34.996	0.01	5
7	34.996	0.03	5
8	34.992	0.02	5
9	34.992	0.03	5
10	35.000	0.02	5
11	34.996	0.03	5
12	34.994	0.03	5
13	34.992	0.03	5
14	34.998	0.02	5
15	34.988	0.02	5
16	35.000	0.02	5
17	34.984	0.01	5
18	35.002	0.04	5
19	34.988	0.02	5
20	34.994	0.01	5
21	34.992	0.02	5
22	35.002	0.01	5
23	35.004	0.04	5
24	34.996	0.03	5
25	34.994	0.01	5

Figure 43.5: The Summary Data Set WAFRHIST

There are four variables in the data set WAFRHIST.

BATCH contains the subgroup index.
DIAMTRX contains the subgroup means.
DIAMTRR contains the subgroup ranges.
DIAMTRN 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 DIAMTR 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" .

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