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Rick Aster: Professional SAS Programming Shortcuts: Contents

Chapter 23
Program
Value informats for validation

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proc format;
invalue nnz
   low-<0 = 0
   other = _same_;
invalue nnx
   low-<0 = _error_
   other = _same_;
invalue nu (upcase just)
   'N/A' = .a
   'UNK.' = .k
   other = [comma12.];
run;