Handbook of SAS DATA Step Programming

110 Handbook of SAS

®

DATA Step Programming

Observations arecombined based on their relative position in each data set.

The rst observation in the rst data set, for example, is combined with the

rst observation in the remaining data sets. The number of observations in

the combined data set is equal to the number of observations in the smallest

input data set. If the input data sets share common variables, only the values

read in from the last data set are kept. Here’s the syntax for reading two

input data sets using one-to-one reading:

SET data-set-1;

SET data-set-2;

Program 7.4 utilizes one-to-one reading to combine data sets RECORD1 and

RECORD2. Notice that the number of observations in the combined data

set is 4, which is equal to the numb ...