Actually, as I look more closely at your original example, the problem might be a lot easier. Does the following do what you want?: data anova_03b0 (keep=extremity_0) anova_03b1 (drop=extremity_0); set anova_03b; if missing(extremity_1) then output anova_03b0; else output anova_03b1; run; data anova_03bb; set anova_03b1; set anova_03b0; run;
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