Hi, Please help. I am trying to impute my data (contiounous), and these are the variables. Starting from y_T11, the missing starts. I have my code as below. However, SAS always gave me error message Variable N N Miss y_T0 39 0 y_T1 39 0 y_T2 39 0 y_T3 39 0 y_T4 39 0 y_T5 39 0 y_T6 39 0 y_T7 39 0 y_T8 39 0 y_T9 39 0 y_T10 39 0 y_T11 37 2 y_T12 35 4 y_T13 34 5 y_T14 27 12 y_T15 25 14 y_T16 20 19 y_T17 16 23 y_T18 13 26 y_T19 6 33 y_T20 6 33 proc mi data=y_hr_wide nimpute=30 out=imp_reg seed=1234 ; class gender; /*patient charactersitic data are not missing.*/ var gender age bmi y_T0 y_T1 y_T2 y_T3 y_T4 y_T5 y_T6 y_T7 y_T8 y_T9 y_T10 y_T11 y_T12 y_T13 y_T14 y_T15 y_T16 y_T17 y_T18 y_T19 y_T20; fcs regpmm(y_T11 = gender age bmi y_T0 y_T1 y_T2 y_T3 y_T4 y_T5 y_T6 y_T7 y_T8 y_T9 y_T10) ; fcs regpmm(y_T12 = gender age bmi y_T0 y_T1 y_T2 y_T3 y_T4 y_T5 y_T6 y_T7 y_T8 y_T9 y_T10 y_T11) ; fcs regpmm(y_T13 = gender age bmi y_T0 y_T1 y_T2 y_T3 y_T4 y_T5 y_T6 y_T7 y_T8 y_T9 y_T10 y_T11 y_T12); fcs regpmm(y_T14 = gender age bmi y_T0 y_T1 y_T2 y_T3 y_T4 y_T5 y_T6 y_T7 y_T8 y_T9 y_T10 y_T11 y_T12 y_T13) ; fcs regpmm(y_T15 = gender age bmi y_T0 y_T1 y_T2 y_T3 y_T4 y_T5 y_T6 y_T7 y_T8 y_T9 y_T10 y_T11 y_T13 y_T14) ; fcs reg(y_T16 = gender age bmi y_T0 y_T1 y_T2 y_T3 y_T4 y_T5 y_T6 y_T7 y_T8 y_T9 y_T10 y_T11 y_T13 y_T14 y_T15) ; fcs reg(y_T17 = gender age bmi y_T0 y_T1 y_T2 y_T3 y_T4 y_T5 y_T6 y_T7 y_T8 y_T9 y_T10 y_T11 y_T13 y_T14 y_T15 y_T16) ; fcs reg(y_T18 = gender age bmi y_T0 y_T1 y_T2 y_T3 y_T4 y_T5 y_T6 y_T7 y_T8 y_T9 y_T10 y_T11 y_T13 y_T14 y_T15 y_T16 y_T17) ; fcs reg(y_T19 = gender age bmi y_T0 y_T1 y_T2 y_T3 y_T4 y_T5 y_T6 y_T7 y_T8 y_T9 y_T10 y_T11 y_T13 y_T14 y_T15 y_T16 y_T17 y_T18) ; fcs reg(y_T20 = gender age bmi y_T0 y_T1 y_T2 y_T3 y_T4 y_T5 y_T6 y_T7 y_T8 y_T9 y_T10 y_T11 y_T13 y_T14 y_T15 y_T16 y_T17 y_T18 y_T19) ; run; ERROR: Not enough observations to fit regression models for variable y_T16 with an FCS regression method. I am able to impute T11-T15 successfully, but every time starting T16, it failed. I searched online and I couldn't find anything. I tried to simplify the regression model many ways and still not working. What are the possible reasons and how to fix this? Please help! I am waiting online and Thanks a lot!
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