The LOGG values produced in the OUT= data set on the PRIOR statement in PROC MIXED are computed incorrectly. The following sample program can be used to produce the OUT= data set in question, showing the location of the LOGG values.

  data sp;
     input Block A B Y @@;
     datalines;
   1 1 1  56  1 1 2  41
   1 2 1  50  1 2 2  36
   1 3 1  39  1 3 2  35
   2 1 1  30  2 1 2  25
   2 2 1  36  2 2 2  28
   2 3 1  33  2 3 2  30
   3 1 1  32  3 1 2  24
   3 2 1  31  3 2 2  27
   3 3 1  15  3 3 2  19
   4 1 1  30  4 1 2  25
   4 2 1  35  4 2 2  30
   4 3 1  17  4 3 2  18
   ;

   proc mixed data=sp;
      class A B Block;
      model Y = A B A*B;
      random Block A*Block;
      prior /out=post ptrans seed=1234;
    run;

 proc print data=post;
 run;

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Operating System and Release Information

A fix for this issue for SAS/STAT 9.22 is available at: