In the last program,it was very obvious that the DATA step was unnecessary. Sometimes, it is a bit more subtle.Examine this example:
Example – INEFFICIENTDATA ONE;
Now examine the following program which eliminates the entire EXTRA data set and creates the variable AGEGRP at the same time the original data set is constructed.
Example – EFFICIENTDATA ONE;
Even though our conceptions of the processes that need to be performed are often like the inefficient example (that is step-wise),if you plan ahead, you can usually avoid unnecessary and inefficient operations. In this case, you realized that the variable AGEGRP should be created at the same time the original data set is built.
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