I am very sorry to be late to response. Yes, when I rewrite the statement as below, the analysis works. However, the analyasis stop with the statement as below. 105 proc anova; 106 class PolyP; 107 model SDS = PolyP; 108 means PolyP/scheffe; run; ERROR: One or more variables are missing or freq or weight is zero on every observation. 114 proc GLM; 115 class PolyP PCS Age sex; 116 model SDS = PolyP PCS Age sex; 117 means PolyP; 118 119 ERROR: One or more variables are missing or freq or weight is zero on every observation. Could you indicate my mistake?? with best regards, Yousuke
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