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A Lazy Programmer Case Study: Dynamic Macro Code To Deal With Changing Number Of Variables Over Time
The U.S. Census Bureau performs an annual data collection for the National Center for Education Statistics. As part of the file documentation, the Census Bureau produces a summary table that shows the minimum, maximum, and mean value for each continuous variable, along with the number of records that have a value greater than or equal to zero, the number of records with missing values, and the number of records with “not applicable” values.
The number of data items collected can change each year. A true lazy programmer will write code that can automatically accommodate such changes. This case study shows how we use the SASHELP.VCOLUMN view and CALL SYMPUTX to write a program that can be reused every year with minimal changes. This paper assumes that the reader has an intermediate understanding of SAS® macros and the DATA step.
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