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 The X11 Procedure

## Example 21.2: Components Estimation - Quarterly Data

This example is similar to Example 21.1, except quarterly data is used. Tables B1, the original series, and D11, the final seasonally adjusted series, are printed by the TABLES statement. The OUTPUT statement writes the listed tables to an output data set.

```   data quarter;
input date yyq6. +1 fy35rr 5.2;
format date yyq6.;
datalines;
1971Q1 6.59
1971Q2 6.01
1971Q3 6.51
1971Q4 6.18
1972Q1 5.52
1972Q2 5.59
1972Q3 5.84
1972Q4 6.33
1973Q1 6.52
1973Q2 7.35
1973Q3 9.24
1973Q4 10.08
1974Q1 9.91
1974Q2 11.15
1974Q3 12.40
1974Q4 11.64
1975Q1 9.94
1975Q2 8.16
1975Q3 8.22
1975Q4 8.29
1976Q1 7.54
1976Q2 7.44
1976Q3 7.80
1976Q4 7.28
run;

proc x11 data=quarter;
var fy35rr;
quarterly date=date;
tables b1 d11;
output out=out b1=b1 d10=d10 d11=d11 d12=d12 d13=d13;
run;
```

Output 21.2.1: Printed Output of PROC X11 Quarterly Example

 The X11 Procedure

 X-11 Seasonal Adjustment Program U. S. Bureau of the Census Economic Research and Analysis Division November 1, 1968 The X-11 program is divided into seven major parts. Part Description A. Prior adjustments, if any B. Preliminary estimates of irregular component weights and regression trading day factors C. Final estimates of above D. Final estimates of seasonal, trend-cycle and irregular components E. Analytical tables F. Summary measures G. Charts Series - fy35rr Period covered - 1st Quarter 1971 to 4th Quarter 1976

 The X11 Procedure Seasonal Adjustment of - fy35rr

 B1 Original Series Year 1st 2nd 3rd 4th Total 1971 6.590 6.010 6.510 6.180 25.290 1972 5.520 5.590 5.840 6.330 23.280 1973 6.520 7.350 9.240 10.080 33.190 1974 9.910 11.150 12.400 11.640 45.100 1975 9.940 8.160 8.220 8.290 34.610 1976 7.540 7.440 7.800 7.280 30.060 Avg 7.670 7.617 8.335 8.300

 Total: 191.53 Mean: 7.9804 S.D.: 1.9424

 The X11 Procedure Seasonal Adjustment of - fy35rr

 D11 Final Seasonally Adjusted Series Year 1st 2nd 3rd 4th Total 1971 6.877 6.272 6.222 5.956 25.326 1972 5.762 5.836 5.583 6.089 23.271 1973 6.820 7.669 8.840 9.681 33.009 1974 10.370 11.655 11.855 11.160 45.040 1975 10.418 8.534 7.853 7.947 34.752 1976 7.901 7.793 7.444 6.979 30.116 Avg 8.025 7.960 7.966 7.969

 Total: 191.51 Mean: 7.9797 S.D.: 1.9059

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