| Working with Time Series Data | 
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| Using SAS Data Set Options | 
You can use the OBS= and FIRSTOBS= data set options to subset the input data set. 
For example, the following statements print observations 20 through 25 of the data set FULL: 
proc print data=full(firstobs=20 obs=25);
run;
    Figure 3.3
    Partial Listing of Data Set FULL
| 21OCT1993 | NC | 20 | 0.44803 | 0.35302 | 0.44803 | 
| 22OCT1993 | NC | 21 | 0.03186 | 1.67414 | 0.03186 | 
| 23OCT1993 | NC | 22 | -0.25232 | -1.61289 | -0.25232 | 
| 24OCT1993 | NC | 23 | 0.42524 | 0.73112 | 0.42524 | 
| 25OCT1993 | NC | 24 | 0.05494 | -0.88664 | 0.05494 | 
| 26OCT1993 | NC | 25 | -0.29096 | -1.17275 | -0.29096 | 
 
 
 
  You can use KEEP= and DROP= data set options to exclude variables from the input data set. See SAS Language Reference: Dictionary for information about SAS data set options. 
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