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 EWMACHART Statement

## Saving Summary Statistics

 See MACEW1 in the SAS/QC Sample Library

In this example, the EWMACHART statement is used to create a summary data set that can be read later by the MACONTROL procedure (as in the preceding example). The following statements read measurements from the data set CLIPS1 and create a summary data set named CLIPHIST:

```   title 'Summary Data Set for Gap Measurements';
proc macontrol data=clips1;
ewmachart gap*day / weight     = 0.3
outhistory = cliphist
nochart;
run;
```

The OUTHISTORY= option names the output data set, and the NOCHART option suppresses the display of the chart, which would be identical to the chart in Figure 20.2.

Figure 20.5 contains a listing of CLIPHIST.

 Summary Data Set for Gap Measurements

 day gapX gapS gapE gapN 1 14.904 0.18716 14.9362 5 2 15.014 0.09317 14.9595 5 3 14.866 0.25006 14.9315 5 4 15.048 0.23732 14.9664 5 5 15.024 0.26792 14.9837 5 6 15.126 0.12260 15.0264 5 7 15.220 0.23098 15.0845 5 8 14.902 0.17254 15.0297 5 9 14.910 0.19824 14.9938 5 10 14.932 0.24035 14.9753 5 11 15.096 0.25618 15.0115 5 12 14.912 0.16903 14.9816 5 13 15.138 0.15928 15.0285 5 14 14.798 0.26329 14.9594 5 15 14.944 0.20876 14.9548 5 16 14.896 0.09965 14.9371 5 17 14.734 0.22512 14.8762 5 18 15.046 0.24141 14.9271 5 19 14.702 0.17880 14.8596 5 20 14.788 0.16634 14.8381 5
Figure 20.5: The Summary Data Set CLIPHIST

There are five variables in the data set CLIPHIST.

• DAY contains the subgroup index.
• GAPX contains the subgroup means.
• GAPS contains the subgroup standard deviations.
• GAPE contains the subgroup exponentially weighted moving averages.
• GAPN contains the subgroup sample sizes.

Note that the summary statistic variables are named by adding the suffix characters X, S, E, and N to the process GAP specified in the EWMACHART 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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