Example 8.5 Accessing a Specific Number of Observations from the Beginning and End of a Data Set
Goal
Process a specific number of observations at the beginning and end of a data set. Efficiently access the observations by not reading the entire data set. If the total number of observations in the data set is less than the sum of observations to access, process the entire data set.
Example Features
| Featured Step | DATA step |
| Featured Step Options and Statements | Direct access, SET statement, NOBS= and POINT= options |
Input Data Set
Data set BLOODPRESSURE contains 20 blood pressure measurements.
BLOODPRESSURE
Obs bptime systolic diastolic pulse 1 8:20 160 90 99 2 8:22 171 92 103 3 8:24 158 88 102 4 8:30 155 90 93 5 8:43 144 88 90 6 8:51 145 82 88 ...Get Combining and Modifying SAS® Data Sets: Examples Second Edition now with the O’Reilly learning platform.
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