You need to restructure your data so that BL(baseline?) is a category of a single CLASS variable (TIME?) that will have two levels, BASELINE and POST (perhaps). the values of BLdist1-BLdist5 will be assigned to dist1-dist5 when the class variable is equal to BASELINE. data need; set have; TIME='POST '; output; TIME='BASELINE'; dist1=bldist1; dist2=bldist2; ... output; run;
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