Chapter 21: Creating Multiple Observations from a Single Raw Data Record

  1. Correct answer: d
    The double trailing at-sign (@@) enables the next INPUT statement to read from the current record across multiple iterations of the DATA step. It must be the last item specified in the INPUT statement. A record that is being held by the double trailing at-sign (@@) is not released until the input pointer moves past the end of the record, or until an INPUT statement that has no line-hold specifier executes.
  2. Correct answer: b
    Unlike the double trailing at-sign (@@), the single trailing at-sign (@) is automatically released when control returns to the top of the DATA step for the next iteration. The trailing @ does not toggle on and off. If another ...

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