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Rick Aster: Professional SAS Programming Shortcuts: Contents

Chapter 13
Program
Writing hierarchical data

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PROC SORT DATA=TAX.FERN OUT=WORK.FERNS;
   BY ORDER FAMILY GENUS SPECIES;
RUN;
DATA _NULL_;
   SET WORK.FERNS;
   BY ORDER FAMILY GENUS SPECIES;
   FILE FERN;
   IF FIRST.ORDER THEN PUT @1 'O' @3 ORDER $F24.;
   IF FIRST.FAMILY THEN PUT @1 'F' @3 FAMILY $F24.;
   IF FIRST.GENUS THEN PUT @1 'G' @3 GENUS $F24. @28 GENUSC $F24.;
   PUT @1 'S' @3 SPECIES $F24. @28 SPECIESC $F24.;
   OUTPUT;
RUN;