I used the regression method. Based on the sas user guild, if the data is monotone, the two statement should get the same result. But I can never get the same result even in the simplest case. data monotone; input id a b; datalines; 1 1 2 2 1 2 3 1 3 4 1 . 5 2 3 ; PROC mi data=monotone out=mi_1 nimpute=1 seed=75319 ; class a; monotone reg(b /details ); VAR a b; run; PROC mi data=monotone out=mi_0 nimpute=1 seed=75319 ; class a; fcs nbiter=0 reg( b ); VAR a b; run;
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