how to resolve proc Mi warning: Between -imputation variance is zero for variable ?

[dsam]

[Ksharp]

That means variable '_bin_' have the same value in all the obs (under that special BY group).

[dsam]

How can i resolve this issue?

[Ksharp]

Make your variable '_bin_' have different values ,otherwise it is nonsense for PROC MIANAZE or PROC MI .

[dsam]

How can I make it different value ? the problem is code is working fine generating different values for all other visits but only for one visit, it is generating same values. How can i obtain different values for this particular value?

[dsam]

Below is the code i used to generate _bin_ values which is generating same value for a one specific visit. 

proc freq data= adeffimp01 ;
      by _imputation_ &trt. &trt.n avisitn avisit;
    tables aval/ binomial;
    exact binomial;
    output out = i_bin bin;
  run; 

[Ksharp]

And I think you should use only one BY :
by _imputation_ &trt. &trt.n avisitn avisit;
-->
by _imputation_ ;
since it presents the imputing ID .

Otherwise, you should include all these variables in BY statement of PROC MI .

[Ksharp]

Try change your PROC MI code, use other imputed method like FCS , MONOTINC,LOGISTIC ......... to make variable have different value.