Processing a DATA Step That Creates One Observation per Header Record
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During the compilation phase, the variable type is flagged so that later it can be dropped. The value for Address and Total (sum statement) are retained.
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As the execution begins, _N_ is 1 and Last is 0. Total is 0 because of the sum statement.
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The value for Type is read, the condition type='H' is true, and therefore the statements in the DO group execute.
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The condition N>1 is not true, so the OUTPUT statement is not executed. However, Total is assigned ...
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